21012102222102 has 64 divisors (see below), whose sum is σ = 48305325585600. Its totient is φ = 6762285734400.

The previous prime is 21012102222101. The next prime is 21012102222103. The reversal of 21012102222102 is 20122220121012.

It is a happy number.

21012102222102 is a `hidden beast` number, since 21 + 0 + 1 + 210 + 222 + 210 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21012102222101) and next prime (21012102222103).

It is a super-2 number, since 2×21012102222102² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012102222101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49274868 + ... + 49699464.

It is an arithmetic number, because the mean of its divisors is an integer number (754770712275).

Almost surely, 2^{21012102222102} is an apocalyptic number.

21012102222102 is an abundant number, since it is smaller than the sum of its proper divisors (27293223363498).

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

21012102222102 is a wasteful number, since it uses less digits than its factorization.

21012102222102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456238 (or 456232 counting only the distinct ones).

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

Adding to 21012102222102 its reverse (20122220121012), we get a palindrome (41134322343114).

The spelling of 21012102222102 in words is "twenty-one trillion, twelve billion, one hundred two million, two hundred twenty-two thousand, one hundred two".