21420797144 has 16 divisors (see below), whose sum is σ = 42277889400. Its totient is φ = 10146693312.

The previous prime is 21420797117. The next prime is 21420797159. The reversal of 21420797144 is 44179702412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70462997 + ... + 70463300.

Almost surely, 2^21420797144 is an apocalyptic number.

It is an amenable number.

21420797144 is a deficient number, since it is larger than the sum of its proper divisors (20857092256).

21420797144 is a wasteful number, since it uses less digits than its factorization.

21420797144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140926322 (or 140926318 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 41.

The spelling of 21420797144 in words is "twenty-one billion, four hundred twenty million, seven hundred ninety-seven thousand, one hundred forty-four".