21012001212102 has 16 divisors (see below), whose sum is σ = 42144415042800. Its totient is φ = 6983931634272.

The previous prime is 21012001212091. The next prime is 21012001212131. The reversal of 21012001212102 is 20121210021012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5017190173 + ... + 5017194360.

It is an arithmetic number, because the mean of its divisors is an integer number (2634025940175).

Almost surely, 2^{21012001212102} is an apocalyptic number.

21012001212102 is an abundant number, since it is smaller than the sum of its proper divisors (21132413830698).

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

21012001212102 is a wasteful number, since it uses less digits than its factorization.

21012001212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10034384887.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21012001212102 its reverse (20121210021012), we get a palindrome (41133211233114).

The spelling of 21012001212102 in words is "twenty-one trillion, twelve billion, one million, two hundred twelve thousand, one hundred two".