21073474144 has 24 divisors (see below), whose sum is σ = 42056741160. Its totient is φ = 10392397056.

The previous prime is 21073474139. The next prime is 21073474151. The reversal of 21073474144 is 44147437012.

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, 4508254 + ... + 4512925.

It is an arithmetic number, because the mean of its divisors is an integer number (1752364215).

Almost surely, 2^21073474144 is an apocalyptic number.

It is an amenable number.

21073474144 is a deficient number, since it is larger than the sum of its proper divisors (20983267016).

21073474144 is an equidigital number, since it uses as much as digits as its factorization.

21073474144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9021262 (or 9021254 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 37.

The spelling of 21073474144 in words is "twenty-one billion, seventy-three million, four hundred seventy-four thousand, one hundred forty-four".