21338421600 has 72 divisors (see below), whose sum is σ = 69456570120. Its totient is φ = 5690245120.

The previous prime is 21338421583. The next prime is 21338421659. The reversal of 21338421600 is 612483312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4443105 + ... + 4447904.

It is an arithmetic number, because the mean of its divisors is an integer number (964674585).

Almost surely, 2^21338421600 is an apocalyptic number.

21338421600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21338421600 is an abundant number, since it is smaller than the sum of its proper divisors (48118148520).

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

21338421600 is a wasteful number, since it uses less digits than its factorization.

21338421600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8891032 (or 8891019 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 21338421600 in words is "twenty-one billion, three hundred thirty-eight million, four hundred twenty-one thousand, six hundred".