21364395501 has 16 divisors (see below), whose sum is σ = 29155613696. Its totient is φ = 13908219696.

The previous prime is 21364395421. The next prime is 21364395523. The reversal of 21364395501 is 10559346312.

It is not a de Polignac number, because 21364395501 - 2²⁹ = 20827524589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21364395501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364395571) 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, 559836 + ... + 596778.

It is an arithmetic number, because the mean of its divisors is an integer number (1822225856).

Almost surely, 2^21364395501 is an apocalyptic number.

It is an amenable number.

21364395501 is a deficient number, since it is larger than the sum of its proper divisors (7791218195).

21364395501 is a wasteful number, since it uses less digits than its factorization.

21364395501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41472.

The product of its (nonzero) digits is 97200, while the sum is 39.

The spelling of 21364395501 in words is "twenty-one billion, three hundred sixty-four million, three hundred ninety-five thousand, five hundred one".