21211012210122 has 48 divisors (see below), whose sum is σ = 52535615363712. Its totient is φ = 6058776633120.

The previous prime is 21211012210067. The next prime is 21211012210123. The reversal of 21211012210122 is 22101221011212.

21211012210122 is a `hidden beast` number, since 212 + 110 + 1 + 221 + 0 + 122 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21211012210095 and 21211012210104.

It is not an unprimeable number, because it can be changed into a prime (21211012210123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20501029 + ... + 21510792.

It is an arithmetic number, because the mean of its divisors is an integer number (1094491986744).

Almost surely, 2^{21211012210122} is an apocalyptic number.

21211012210122 is an abundant number, since it is smaller than the sum of its proper divisors (31324603153590).

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

21211012210122 is a wasteful number, since it uses less digits than its factorization.

21211012210122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42015843 (or 42015840 counting only the distinct ones).

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

Adding to 21211012210122 its reverse (22101221011212), we get a palindrome (43312233221334).

The spelling of 21211012210122 in words is "twenty-one trillion, two hundred eleven billion, twelve million, two hundred ten thousand, one hundred twenty-two".