21202012010923 has 2 divisors, whose sum is σ = 21202012010924. Its totient is φ = 21202012010922.

The previous prime is 21202012010917. The next prime is 21202012011053. The reversal of 21202012010923 is 32901021020212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202012010923 is a prime.

It is a super-2 number, since 2×21202012010923² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21202012010903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601006005461 + 10601006005462.

It is an arithmetic number, because the mean of its divisors is an integer number (10601006005462).

Almost surely, 2^{21202012010923} is an apocalyptic number.

21202012010923 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202012010923 is an equidigital number, since it uses as much as digits as its factorization.

21202012010923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 21202012010923 in words is "twenty-one trillion, two hundred two billion, twelve million, ten thousand, nine hundred twenty-three".