21002013132 has 12 divisors (see below), whose sum is σ = 49004697336. Its totient is φ = 7000671040.

The previous prime is 21002013107. The next prime is 21002013209. The reversal of 21002013132 is 23131020012.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 875083869 + ... + 875083892.

It is an arithmetic number, because the mean of its divisors is an integer number (4083724778).

Almost surely, 2^21002013132 is an apocalyptic number.

It is an amenable number.

21002013132 is an abundant number, since it is smaller than the sum of its proper divisors (28002684204).

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

21002013132 is a wasteful number, since it uses less digits than its factorization.

21002013132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750167768 (or 1750167766 counting only the distinct ones).

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

Adding to 21002013132 its reverse (23131020012), we get a palindrome (44133033144).

The spelling of 21002013132 in words is "twenty-one billion, two million, thirteen thousand, one hundred thirty-two".