21462621 has 4 divisors (see below), whose sum is σ = 28616832. Its totient is φ = 14308412.

The previous prime is 21462613. The next prime is 21462629. The reversal of 21462621 is 12626412.

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 an interprime number because it is at equal distance from previous prime (21462613) and next prime (21462629).

It is a cyclic number.

It is not a de Polignac number, because 21462621 - 2³ = 21462613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21462591 and 21462600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21462629) 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, 3577101 + ... + 3577106.

It is an arithmetic number, because the mean of its divisors is an integer number (7154208).

Almost surely, 2^21462621 is an apocalyptic number.

It is an amenable number.

21462621 is a deficient number, since it is larger than the sum of its proper divisors (7154211).

21462621 is an equidigital number, since it uses as much as digits as its factorization.

21462621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7154210.

The product of its digits is 1152, while the sum is 24.

The square root of 21462621 is about 4632.7768131003. The cubic root of 21462621 is about 277.9036508581.

It can be divided in two parts, 214 and 62621, that added together give a triangular number (62835 = T₃₅₄).

The spelling of 21462621 in words is "twenty-one million, four hundred sixty-two thousand, six hundred twenty-one".