21130021032 has 32 divisors (see below), whose sum is σ = 52906737600. Its totient is φ = 7032449024.

The previous prime is 21130021027. The next prime is 21130021037. The reversal of 21130021032 is 23012003112.

It is an interprime number because it is at equal distance from previous prime (21130021027) and next prime (21130021037).

It is not an unprimeable number, because it can be changed into a prime (21130021037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664857 + ... + 695912.

It is an arithmetic number, because the mean of its divisors is an integer number (1653335550).

Almost surely, 2^21130021032 is an apocalyptic number.

It is an amenable number.

21130021032 is an abundant number, since it is smaller than the sum of its proper divisors (31776716568).

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

21130021032 is a wasteful number, since it uses less digits than its factorization.

21130021032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361425 (or 1361421 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21130021032 its reverse (23012003112), we get a palindrome (44142024144).

The spelling of 21130021032 in words is "twenty-one billion, one hundred thirty million, twenty-one thousand, thirty-two".