21020012130 has 48 divisors (see below), whose sum is σ = 54627168960. Its totient is φ = 5174155584.

The previous prime is 21020012129. The next prime is 21020012161. The reversal of 21020012130 is 3121002012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2067910 + ... + 2078049.

It is an arithmetic number, because the mean of its divisors is an integer number (1138066020).

Almost surely, 2^21020012130 is an apocalyptic number.

21020012130 is an abundant number, since it is smaller than the sum of its proper divisors (33607156830).

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

21020012130 is a wasteful number, since it uses less digits than its factorization.

21020012130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4145995 (or 4145982 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21020012130 its reverse (3121002012), we get a palindrome (24141014142).

The spelling of 21020012130 in words is "twenty-one billion, twenty million, twelve thousand, one hundred thirty".