21012212112102 has 32 divisors (see below), whose sum is σ = 46721815574400. Its totient is φ = 6999869071944.

The previous prime is 21012212112091. The next prime is 21012212112107. The reversal of 21012212112102 is 20121121221012.

21012212112102 is a `hidden beast` number, since 21 + 0 + 1 + 221 + 211 + 210 + 2 = 666.

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 (21012212112107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116621152 + ... + 116801187.

It is an arithmetic number, because the mean of its divisors is an integer number (1460056736700).

Almost surely, 2^{21012212112102} is an apocalyptic number.

21012212112102 is an abundant number, since it is smaller than the sum of its proper divisors (25709603462298).

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

21012212112102 is a wasteful number, since it uses less digits than its factorization.

21012212112102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233424017 (or 233424011 counting only the distinct ones).

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

Adding to 21012212112102 its reverse (20121121221012), we get a palindrome (41133333333114).

The spelling of 21012212112102 in words is "twenty-one trillion, twelve billion, two hundred twelve million, one hundred twelve thousand, one hundred two".