21111211002102 has 16 divisors (see below), whose sum is σ = 45470300620080. Its totient is φ = 6495757231392.

The previous prime is 21111211002073. The next prime is 21111211002137. The reversal of 21111211002102 is 20120011211112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135328275577 + ... + 135328275732.

It is an arithmetic number, because the mean of its divisors is an integer number (2841893788755).

Almost surely, 2^{21111211002102} is an apocalyptic number.

21111211002102 is an abundant number, since it is smaller than the sum of its proper divisors (24359089617978).

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

21111211002102 is a wasteful number, since it uses less digits than its factorization.

21111211002102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270656551327.

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

Adding to 21111211002102 its reverse (20120011211112), we get a palindrome (41231222213214).

The spelling of 21111211002102 in words is "twenty-one trillion, one hundred eleven billion, two hundred eleven million, two thousand, one hundred two".