21150420492 has 48 divisors (see below), whose sum is σ = 50695489152. Its totient is φ = 6859345920.

The previous prime is 21150420481. The next prime is 21150420493. The reversal of 21150420492 is 29402405112.

It is not an unprimeable number, because it can be changed into a prime (21150420493) 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 15 ways as a sum of consecutive naturals, for example, 52867 + ... + 212357.

It is an arithmetic number, because the mean of its divisors is an integer number (1056156024).

Almost surely, 2^21150420492 is an apocalyptic number.

It is an amenable number.

21150420492 is an abundant number, since it is smaller than the sum of its proper divisors (29545068660).

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

21150420492 is a wasteful number, since it uses less digits than its factorization.

21150420492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159798 (or 159796 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 21150420492 in words is "twenty-one billion, one hundred fifty million, four hundred twenty thousand, four hundred ninety-two".