21012023093 has 2 divisors, whose sum is σ = 21012023094. Its totient is φ = 21012023092.

The previous prime is 21012023089. The next prime is 21012023099. The reversal of 21012023093 is 39032021012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13321083889 + 7690939204 = 115417^2 + 87698^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012023093 - 2² = 21012023089 is a prime.

It is a super-2 number, since 2×21012023093² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012023099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506011546 + 10506011547.

It is an arithmetic number, because the mean of its divisors is an integer number (10506011547).

Almost surely, 2^21012023093 is an apocalyptic number.

It is an amenable number.

21012023093 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012023093 is an equidigital number, since it uses as much as digits as its factorization.

21012023093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 21012023093 in words is "twenty-one billion, twelve million, twenty-three thousand, ninety-three".