21420402412 has 48 divisors (see below), whose sum is σ = 39909542400. Its totient is φ = 10037730560.

The previous prime is 21420402403. The next prime is 21420402449.

21420402412 is nontrivially palindromic in base 10.

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 15 ways as a sum of consecutive naturals, for example, 1681764 + ... + 1694452.

It is an arithmetic number, because the mean of its divisors is an integer number (831448800).

Almost surely, 2^21420402412 is an apocalyptic number.

It is an amenable number.

21420402412 is a deficient number, since it is larger than the sum of its proper divisors (18489139988).

21420402412 is a wasteful number, since it uses less digits than its factorization.

21420402412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13086 (or 13084 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The spelling of 21420402412 in words is "twenty-one billion, four hundred twenty million, four hundred two thousand, four hundred twelve".