21650710501 has 16 divisors (see below), whose sum is σ = 26055475200. Its totient is φ = 17574610608.

The previous prime is 21650710483. The next prime is 21650710513. The reversal of 21650710501 is 10501705612.

It is a cyclic number.

It is not a de Polignac number, because 21650710501 - 2⁹ = 21650709989 is a prime.

It is a super-2 number, since 2×21650710501² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21650710501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650710531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354636 + ... + 411178.

It is an arithmetic number, because the mean of its divisors is an integer number (1628467200).

Almost surely, 2^21650710501 is an apocalyptic number.

It is an amenable number.

21650710501 is a deficient number, since it is larger than the sum of its proper divisors (4404764699).

21650710501 is a wasteful number, since it uses less digits than its factorization.

21650710501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59448.

The product of its (nonzero) digits is 2100, while the sum is 28.

The spelling of 21650710501 in words is "twenty-one billion, six hundred fifty million, seven hundred ten thousand, five hundred one".