21134131900 has 108 divisors (see below), whose sum is σ = 54791496592. Its totient is φ = 6930823680.

The previous prime is 21134131897. The next prime is 21134131937. The reversal of 21134131900 is 913143112.

It is a super-2 number, since 2×21134131900² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 341764 + ... + 398836.

Almost surely, 2^21134131900 is an apocalyptic number.

21134131900 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 21134131900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27395748296).

21134131900 is an abundant number, since it is smaller than the sum of its proper divisors (33657364692).

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

21134131900 is a wasteful number, since it uses less digits than its factorization.

21134131900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57140 (or 57110 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 21134131900 in words is "twenty-one billion, one hundred thirty-four million, one hundred thirty-one thousand, nine hundred".