20412403621 has 4 divisors (see below), whose sum is σ = 20421984544. Its totient is φ = 20402822700.

The previous prime is 20412403601. The next prime is 20412403679. The reversal of 20412403621 is 12630421402.

It is a happy number.

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 20412403621 - 2¹⁷ = 20412272549 is a prime.

It is a super-2 number, since 2×20412403621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20412403601) 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, 4787265 + ... + 4791526.

It is an arithmetic number, because the mean of its divisors is an integer number (5105496136).

Almost surely, 2^20412403621 is an apocalyptic number.

It is an amenable number.

20412403621 is a deficient number, since it is larger than the sum of its proper divisors (9580923).

20412403621 is an equidigital number, since it uses as much as digits as its factorization.

20412403621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9580922.

The product of its (nonzero) digits is 2304, while the sum is 25.

The spelling of 20412403621 in words is "twenty billion, four hundred twelve million, four hundred three thousand, six hundred twenty-one".