21210131110102 has 16 divisors (see below), whose sum is σ = 34708099175424. Its totient is φ = 9640798713000.

The previous prime is 21210131110081. The next prime is 21210131110151. The reversal of 21210131110102 is 20101113101212.

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, 7218174 + ... + 9722257.

It is an arithmetic number, because the mean of its divisors is an integer number (2169256198464).

Almost surely, 2^{21210131110102} is an apocalyptic number.

21210131110102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21210131110102 is a deficient number, since it is larger than the sum of its proper divisors (13497968065322).

21210131110102 is a wasteful number, since it uses less digits than its factorization.

21210131110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16997355.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21210131110102 its reverse (20101113101212), we get a palindrome (41311244211314).

The spelling of 21210131110102 in words is "twenty-one trillion, two hundred ten billion, one hundred thirty-one million, one hundred ten thousand, one hundred two".