21130011232 has 144 divisors (see below), whose sum is σ = 46889956512. Its totient is φ = 9363200000.

The previous prime is 21130011223. The next prime is 21130011241. The reversal of 21130011232 is 23211003112.

It is an interprime number because it is at equal distance from previous prime (21130011223) and next prime (21130011241).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27765732 + ... + 27766492.

It is an arithmetic number, because the mean of its divisors is an integer number (325624698).

Almost surely, 2^21130011232 is an apocalyptic number.

21130011232 is a gapful number since it is divisible by the number (22) 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 21130011232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23444978256).

21130011232 is an abundant number, since it is smaller than the sum of its proper divisors (25759945280).

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

21130011232 is a wasteful number, since it uses less digits than its factorization.

21130011232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965 (or 946 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21130011232 its reverse (23211003112), we get a palindrome (44341014344).

The spelling of 21130011232 in words is "twenty-one billion, one hundred thirty million, eleven thousand, two hundred thirty-two".