21372608501 has 4 divisors (see below), whose sum is σ = 21869645952. Its totient is φ = 20875571052.

The previous prime is 21372608483. The next prime is 21372608513. The reversal of 21372608501 is 10580627312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21372608501 - 2²⁶ = 21305499637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21372608801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248518661 + ... + 248518746.

It is an arithmetic number, because the mean of its divisors is an integer number (5467411488).

Almost surely, 2^21372608501 is an apocalyptic number.

It is an amenable number.

21372608501 is a deficient number, since it is larger than the sum of its proper divisors (497037451).

21372608501 is an equidigital number, since it uses as much as digits as its factorization.

21372608501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497037450.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 21372608501 in words is "twenty-one billion, three hundred seventy-two million, six hundred eight thousand, five hundred one".