21024564420 has 48 divisors (see below), whose sum is σ = 60898743360. Its totient is φ = 5413220736.

The previous prime is 21024564409. The next prime is 21024564461. The reversal of 21024564420 is 2446542012.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6039802 + ... + 6043281.

It is an arithmetic number, because the mean of its divisors is an integer number (1268723820).

Almost surely, 2^21024564420 is an apocalyptic number.

21024564420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21024564420 is an abundant number, since it is smaller than the sum of its proper divisors (39874178940).

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

21024564420 is a wasteful number, since it uses less digits than its factorization.

21024564420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12083124 (or 12083122 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The spelling of 21024564420 in words is "twenty-one billion, twenty-four million, five hundred sixty-four thousand, four hundred twenty".