21374031900 has 144 divisors (see below), whose sum is σ = 68748044288. Its totient is φ = 5091552000.

The previous prime is 21374031871. The next prime is 21374031961. The reversal of 21374031900 is 913047312.

It is a super-2 number, since 2×21374031900² (a number of 21 digits) contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 32505 + ... + 209295.

Almost surely, 2^21374031900 is an apocalyptic number.

21374031900 is a gapful number since it is divisible by the number (20) 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 21374031900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34374022144).

21374031900 is an abundant number, since it is smaller than the sum of its proper divisors (47374012388).

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

21374031900 is a wasteful number, since it uses less digits than its factorization.

21374031900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176852 (or 176845 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 30.

The spelling of 21374031900 in words is "twenty-one billion, three hundred seventy-four million, thirty-one thousand, nine hundred".