21383562420 has 72 divisors (see below), whose sum is σ = 70760158560. Its totient is φ = 5183893440.

The previous prime is 21383562371. The next prime is 21383562427. The reversal of 21383562420 is 2426538312.

21383562420 is a `hidden beast` number, since 2 + 1 + 3 + 8 + 3 + 5 + 624 + 20 = 666.

It is a super-3 number, since 3×21383562420³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21383562427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5397910 + ... + 5401869.

It is an arithmetic number, because the mean of its divisors is an integer number (982779980).

Almost surely, 2^21383562420 is an apocalyptic number.

21383562420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21383562420 is an abundant number, since it is smaller than the sum of its proper divisors (49376596140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21383562420 is a wasteful number, since it uses less digits than its factorization.

21383562420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10799805 (or 10799800 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 21383562420 in words is "twenty-one billion, three hundred eighty-three million, five hundred sixty-two thousand, four hundred twenty".