21300320188 has 36 divisors (see below), whose sum is σ = 43454403720. Its totient is φ = 9109121952.

The previous prime is 21300320143. The next prime is 21300320201. The reversal of 21300320188 is 88102300312.

It is a super-2 number, since 2×21300320188² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 24823 + ... + 207886.

It is an arithmetic number, because the mean of its divisors is an integer number (1207066770).

Almost surely, 2^21300320188 is an apocalyptic number.

21300320188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21300320188 is an abundant number, since it is smaller than the sum of its proper divisors (22154083532).

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

21300320188 is a wasteful number, since it uses less digits than its factorization.

21300320188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233194 (or 233185 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 21300320188 in words is "twenty-one billion, three hundred million, three hundred twenty thousand, one hundred eighty-eight".