21624503461421 has 4 divisors (see below), whose sum is σ = 24713718241632. Its totient is φ = 18535288681212.

The previous prime is 21624503461411. The next prime is 21624503461427. The reversal of 21624503461421 is 12416430542612.

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 21624503461421 - 2⁶ = 21624503461357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21624503461427) 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, 1544607390095 + ... + 1544607390108.

It is an arithmetic number, because the mean of its divisors is an integer number (6178429560408).

Almost surely, 2^{21624503461421} is an apocalyptic number.

It is an amenable number.

21624503461421 is a deficient number, since it is larger than the sum of its proper divisors (3089214780211).

21624503461421 is an equidigital number, since it uses as much as digits as its factorization.

21624503461421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089214780210.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 21624503461421 in words is "twenty-one trillion, six hundred twenty-four billion, five hundred three million, four hundred sixty-one thousand, four hundred twenty-one".