21012082337 has 2 divisors, whose sum is σ = 21012082338. Its totient is φ = 21012082336.

The previous prime is 21012082277. The next prime is 21012082373. The reversal of 21012082337 is 73328021012.

Together with next prime (21012082373) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19962581521 + 1049500816 = 141289^2 + 32396^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012082337 - 2⁸ = 21012082081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21012082237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506041168 + 10506041169.

It is an arithmetic number, because the mean of its divisors is an integer number (10506041169).

Almost surely, 2^21012082337 is an apocalyptic number.

It is an amenable number.

21012082337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012082337 is an equidigital number, since it uses as much as digits as its factorization.

21012082337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The spelling of 21012082337 in words is "twenty-one billion, twelve million, eighty-two thousand, three hundred thirty-seven".