21300232621 has 8 divisors (see below), whose sum is σ = 21828002240. Its totient is φ = 20773936512.

The previous prime is 21300232607. The next prime is 21300232669. The reversal of 21300232621 is 12623200312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21300232621 - 2²⁷ = 21166014893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21300232592 and 21300232601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300232691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339081 + ... + 396958.

It is an arithmetic number, because the mean of its divisors is an integer number (2728500280).

Almost surely, 2^21300232621 is an apocalyptic number.

It is an amenable number.

21300232621 is a deficient number, since it is larger than the sum of its proper divisors (527769619).

21300232621 is an equidigital number, since it uses as much as digits as its factorization.

21300232621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736755.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21300232621 its reverse (12623200312), we get a palindrome (33923432933).

The spelling of 21300232621 in words is "twenty-one billion, three hundred million, two hundred thirty-two thousand, six hundred twenty-one".