21203232199931 has 2 divisors, whose sum is σ = 21203232199932. Its totient is φ = 21203232199930.

The previous prime is 21203232199927. The next prime is 21203232200027. The reversal of 21203232199931 is 13999123230212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21203232199931 - 2² = 21203232199927 is a prime.

It is a super-2 number, since 2×21203232199931² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21203232199901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601616099965 + 10601616099966.

It is an arithmetic number, because the mean of its divisors is an integer number (10601616099966).

Almost surely, 2^{21203232199931} is an apocalyptic number.

21203232199931 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203232199931 is an equidigital number, since it uses as much as digits as its factorization.

21203232199931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 47.

The spelling of 21203232199931 in words is "twenty-one trillion, two hundred three billion, two hundred thirty-two million, one hundred ninety-nine thousand, nine hundred thirty-one".