21021212111022 has 12 divisors (see below), whose sum is σ = 45545959573920. Its totient is φ = 7007070703668.

The previous prime is 21021212111017. The next prime is 21021212111051. The reversal of 21021212111022 is 22011121212012.

21021212111022 is a `hidden beast` number, since 210 + 212 + 1 + 211 + 10 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1167845117279 = 21021212111022 / (2 + 1 + 0 + 2 + 1 + 2 + 1 + 2 + 1 + 1 + 1 + 0 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21021212110986 and 21021212111004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 583922558622 + ... + 583922558657.

It is an arithmetic number, because the mean of its divisors is an integer number (3795496631160).

Almost surely, 2^{21021212111022} is an apocalyptic number.

21021212111022 is an abundant number, since it is smaller than the sum of its proper divisors (24524747462898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021212111022 is a wasteful number, since it uses less digits than its factorization.

21021212111022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167845117287 (or 1167845117284 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21021212111022 its reverse (22011121212012), we get a palindrome (43032333323034).

The spelling of 21021212111022 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, one hundred eleven thousand, twenty-two".