21650710513 has 2 divisors, whose sum is σ = 21650710514. Its totient is φ = 21650710512.

The previous prime is 21650710483. The next prime is 21650710517. The reversal of 21650710513 is 31501705612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14049835024 + 7600875489 = 118532^2 + 87183^2 .

It is a cyclic number.

It is not a de Polignac number, because 21650710513 - 2⁵ = 21650710481 is a prime.

It is not a weakly prime, because it can be changed into another prime (21650710517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10825355256 + 10825355257.

It is an arithmetic number, because the mean of its divisors is an integer number (10825355257).

Almost surely, 2^21650710513 is an apocalyptic number.

It is an amenable number.

21650710513 is a deficient number, since it is larger than the sum of its proper divisors (1).

21650710513 is an equidigital number, since it uses as much as digits as its factorization.

21650710513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 31.

The spelling of 21650710513 in words is "twenty-one billion, six hundred fifty million, seven hundred ten thousand, five hundred thirteen".