212221010111221 has 8 divisors (see below), whose sum is σ = 223391428676000. Its totient is φ = 201050680718160.

The previous prime is 212221010111179. The next prime is 212221010111239. The reversal of 212221010111221 is 122111010122212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212221010111221 - 2²⁵ = 212220976556789 is a prime.

It is a super-2 number, since 2×212221010111221² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221010111021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17380071 + ... + 26953828.

It is an arithmetic number, because the mean of its divisors is an integer number (27923928584500).

Almost surely, 2^{212221010111221} is an apocalyptic number.

It is an amenable number.

212221010111221 is a deficient number, since it is larger than the sum of its proper divisors (11170418564779).

212221010111221 is a wasteful number, since it uses less digits than its factorization.

212221010111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44585859.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212221010111221 its reverse (122111010122212), we get a palindrome (334332020233433).

The spelling of 212221010111221 in words is "two hundred twelve trillion, two hundred twenty-one billion, ten million, one hundred eleven thousand, two hundred twenty-one".