21002020130 has 128 divisors (see below), whose sum is σ = 48906547200. Its totient is φ = 6311188224.

The previous prime is 21002020103. The next prime is 21002020163. The reversal of 21002020130 is 3102020012.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2905661 + ... + 2912879.

It is an arithmetic number, because the mean of its divisors is an integer number (382082400).

Almost surely, 2^21002020130 is an apocalyptic number.

21002020130 is an abundant number, since it is smaller than the sum of its proper divisors (27904527070).

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

21002020130 is a wasteful number, since it uses less digits than its factorization.

21002020130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7408.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21002020130 its reverse (3102020012), we get a palindrome (24104040142).

The spelling of 21002020130 in words is "twenty-one billion, two million, twenty thousand, one hundred thirty".