21131212232120 has 64 divisors (see below), whose sum is σ = 47686927979520. Its totient is φ = 8427323608704.

The previous prime is 21131212232101. The next prime is 21131212232201. The reversal of 21131212232120 is 2123221213112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22183487 + ... + 23116433.

It is an arithmetic number, because the mean of its divisors is an integer number (745108249680).

Almost surely, 2^{21131212232120} is an apocalyptic number.

21131212232120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131212232120 is an abundant number, since it is smaller than the sum of its proper divisors (26555715747400).

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

21131212232120 is a wasteful number, since it uses less digits than its factorization.

21131212232120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934644 (or 934640 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21131212232120 its reverse (2123221213112), we get a palindrome (23254433445232).

The spelling of 21131212232120 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred twelve million, two hundred thirty-two thousand, one hundred twenty".