212110210111221 has 64 divisors (see below), whose sum is σ = 345534353107200. Its totient is φ = 127999491637248.

The previous prime is 212110210111193. The next prime is 212110210111249. The reversal of 212110210111221 is 122111012011212.

It is a happy number.

212110210111221 is a `hidden beast` number, since 2 + 12 + 110 + 210 + 111 + 221 = 666.

212110210111221 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (212110210111193) and next prime (212110210111249).

It is not a de Polignac number, because 212110210111221 - 2¹⁸ = 212110209849077 is a prime.

It is a super-2 number, since 2×212110210111221² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212110210111194 and 212110210111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212110210111271) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27580935 + ... + 34422788.

It is an arithmetic number, because the mean of its divisors is an integer number (5398974267300).

Almost surely, 2^{212110210111221} is an apocalyptic number.

It is an amenable number.

212110210111221 is a deficient number, since it is larger than the sum of its proper divisors (133424142995979).

212110210111221 is a wasteful number, since it uses less digits than its factorization.

212110210111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62004035 (or 62004029 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 212110210111221 its reverse (122111012011212), we get a palindrome (334221222122433).

The spelling of 212110210111221 in words is "two hundred twelve trillion, one hundred ten billion, two hundred ten million, one hundred eleven thousand, two hundred twenty-one".