21131220312032 has 48 divisors (see below), whose sum is σ = 41971433735952. Its totient is φ = 10471813847040.

The previous prime is 21131220312023. The next prime is 21131220312043. The reversal of 21131220312032 is 23021302213112.

It is a junction number, because it is equal to n+sod(n) for n = 21131220311989 and 21131220312007.

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, 186662807 + ... + 186775977.

It is an arithmetic number, because the mean of its divisors is an integer number (874404869499).

Almost surely, 2^{21131220312032} is an apocalyptic number.

It is an amenable number.

21131220312032 is a deficient number, since it is larger than the sum of its proper divisors (20840213423920).

21131220312032 is a wasteful number, since it uses less digits than its factorization.

21131220312032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164931 (or 164923 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21131220312032 its reverse (23021302213112), we get a palindrome (44152522525144).

The spelling of 21131220312032 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred twenty million, three hundred twelve thousand, thirty-two".