21201443992931 has 2 divisors, whose sum is σ = 21201443992932. Its totient is φ = 21201443992930.

The previous prime is 21201443992907. The next prime is 21201443992987. The reversal of 21201443992931 is 13929934410212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201443992931 - 2¹⁴ = 21201443976547 is a prime.

It is a super-2 number, since 2×21201443992931² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21201443992931.

It is not a weakly prime, because it can be changed into another prime (21201443962931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600721996465 + 10600721996466.

It is an arithmetic number, because the mean of its divisors is an integer number (10600721996466).

Almost surely, 2^{21201443992931} is an apocalyptic number.

21201443992931 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201443992931 is an equidigital number, since it uses as much as digits as its factorization.

21201443992931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 21201443992931 in words is "twenty-one trillion, two hundred one billion, four hundred forty-three million, nine hundred ninety-two thousand, nine hundred thirty-one".