21203231101312 has 96 divisors (see below), whose sum is σ = 48010333981680. Its totient is φ = 9271048154112.

The previous prime is 21203231101309. The next prime is 21203231101337. The reversal of 21203231101312 is 21310113230212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17047948 + ... + 18249355.

Almost surely, 2^{21203231101312} is an apocalyptic number.

It is an amenable number.

21203231101312 is an abundant number, since it is smaller than the sum of its proper divisors (26807102880368).

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

21203231101312 is a wasteful number, since it uses less digits than its factorization.

21203231101312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35297368 (or 35297337 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21203231101312 its reverse (21310113230212), we get a palindrome (42513344331524).

The spelling of 21203231101312 in words is "twenty-one trillion, two hundred three billion, two hundred thirty-one million, one hundred one thousand, three hundred twelve".