221212021000221 has 20 divisors (see below), whose sum is σ = 330688731604000. Its totient is φ = 147369266237736.

The previous prime is 221212021000193. The next prime is 221212021000241. The reversal of 221212021000221 is 122000120212122.

It is a happy number.

221212021000221 is a `hidden beast` number, since 2 + 21 + 212 + 0 + 210 + 0 + 0 + 221 = 666.

It is not a de Polignac number, because 221212021000221 - 2¹⁹ = 221212020475933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221212021000194 and 221212021000203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212021000241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 975945511 + ... + 976172148.

It is an arithmetic number, because the mean of its divisors is an integer number (16534436580200).

Almost surely, 2^{221212021000221} is an apocalyptic number.

It is an amenable number.

221212021000221 is a deficient number, since it is larger than the sum of its proper divisors (109476710603779).

221212021000221 is a wasteful number, since it uses less digits than its factorization.

221212021000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952119070 (or 1952119061 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221212021000221 its reverse (122000120212122), we get a palindrome (343212141212343).

The spelling of 221212021000221 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-one million, two hundred twenty-one", and thus it is an aban number.