21214503501 has 32 divisors (see below), whose sum is σ = 29096847360. Its totient is φ = 13744059264.

The previous prime is 21214503493. The next prime is 21214503517. The reversal of 21214503501 is 10530541212.

It is a happy number.

It is not a de Polignac number, because 21214503501 - 2³ = 21214503493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214503701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11123590 + ... + 11125496.

It is an arithmetic number, because the mean of its divisors is an integer number (909276480).

Almost surely, 2^21214503501 is an apocalyptic number.

It is an amenable number.

21214503501 is a deficient number, since it is larger than the sum of its proper divisors (7882343859).

21214503501 is a wasteful number, since it uses less digits than its factorization.

21214503501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705.

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 21214503501 in words is "twenty-one billion, two hundred fourteen million, five hundred three thousand, five hundred one".