21012376597 has 2 divisors, whose sum is σ = 21012376598. Its totient is φ = 21012376596.

The previous prime is 21012376577. The next prime is 21012376663. The reversal of 21012376597 is 79567321012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15011395441 + 6000981156 = 122521^2 + 77466^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012376597 - 2²³ = 21003987989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012376577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506188298 + 10506188299.

It is an arithmetic number, because the mean of its divisors is an integer number (10506188299).

Almost surely, 2^21012376597 is an apocalyptic number.

It is an amenable number.

21012376597 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012376597 is an equidigital number, since it uses as much as digits as its factorization.

21012376597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 43.

The spelling of 21012376597 in words is "twenty-one billion, twelve million, three hundred seventy-six thousand, five hundred ninety-seven".