21321022986737 has 2 divisors, whose sum is σ = 21321022986738. Its totient is φ = 21321022986736.

The previous prime is 21321022986677. The next prime is 21321022986751. The reversal of 21321022986737 is 73768922012312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19673802186256 + 1647220800481 = 4435516^2 + 1283441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321022986737 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321022986037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660511493368 + 10660511493369.

It is an arithmetic number, because the mean of its divisors is an integer number (10660511493369).

Almost surely, 2^{21321022986737} is an apocalyptic number.

It is an amenable number.

21321022986737 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321022986737 is an equidigital number, since it uses as much as digits as its factorization.

21321022986737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The spelling of 21321022986737 in words is "twenty-one trillion, three hundred twenty-one billion, twenty-two million, nine hundred eighty-six thousand, seven hundred thirty-seven".