21130420302 has 24 divisors (see below), whose sum is σ = 45785323584. Its totient is φ = 7043050944.

The previous prime is 21130420273. The next prime is 21130420309. The reversal of 21130420302 is 20302403112.

21130420302 is a `hidden beast` number, since 211 + 3 + 0 + 420 + 30 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130420309) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 466198 + ... + 509510.

It is an arithmetic number, because the mean of its divisors is an integer number (1907721816).

Almost surely, 2^21130420302 is an apocalyptic number.

21130420302 is an abundant number, since it is smaller than the sum of its proper divisors (24654903282).

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

21130420302 is a wasteful number, since it uses less digits than its factorization.

21130420302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70424 (or 70421 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21130420302 its reverse (20302403112), we get a palindrome (41432823414).

The spelling of 21130420302 in words is "twenty-one billion, one hundred thirty million, four hundred twenty thousand, three hundred two".