21130120452 has 36 divisors (see below), whose sum is σ = 57353185680. Its totient is φ = 6037177104.

The previous prime is 21130120423. The next prime is 21130120481. The reversal of 21130120452 is 25402103112.

It is an interprime number because it is at equal distance from previous prime (21130120423) and next prime (21130120481).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17967202 + ... + 17968377.

Almost surely, 2^21130120452 is an apocalyptic number.

It is an amenable number.

21130120452 is an abundant number, since it is smaller than the sum of its proper divisors (36223065228).

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

21130120452 is a wasteful number, since it uses less digits than its factorization.

21130120452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35935600 (or 35935591 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21130120452 its reverse (25402103112), we get a palindrome (46532223564).

The spelling of 21130120452 in words is "twenty-one billion, one hundred thirty million, one hundred twenty thousand, four hundred fifty-two".