21012111012102 has 16 divisors (see below), whose sum is σ = 48027682313472. Its totient is φ = 6003460289160.

The previous prime is 21012111012017. The next prime is 21012111012107. The reversal of 21012111012102 is 20121011121012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012111012107) 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 7 ways as a sum of consecutive naturals, for example, 250144178674 + ... + 250144178757.

It is an arithmetic number, because the mean of its divisors is an integer number (3001730144592).

Almost surely, 2^{21012111012102} is an apocalyptic number.

21012111012102 is an abundant number, since it is smaller than the sum of its proper divisors (27015571301370).

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

21012111012102 is a wasteful number, since it uses less digits than its factorization.

21012111012102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500288357443.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21012111012102 its reverse (20121011121012), we get a palindrome (41133122133114).

The spelling of 21012111012102 in words is "twenty-one trillion, twelve billion, one hundred eleven million, twelve thousand, one hundred two".