21300220944 has 160 divisors (see below), whose sum is σ = 63389692800. Its totient is φ = 6842972160.

The previous prime is 21300220901. The next prime is 21300220951. The reversal of 21300220944 is 44902200312.

It is a super-2 number, since 2×21300220944² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1462852 + ... + 1477340.

It is an arithmetic number, because the mean of its divisors is an integer number (396185580).

Almost surely, 2^21300220944 is an apocalyptic number.

21300220944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21300220944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31694846400).

21300220944 is an abundant number, since it is smaller than the sum of its proper divisors (42089471856).

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

21300220944 is a wasteful number, since it uses less digits than its factorization.

21300220944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14630 (or 14618 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The spelling of 21300220944 in words is "twenty-one billion, three hundred million, two hundred twenty thousand, nine hundred forty-four".