21554532424 has 16 divisors (see below), whose sum is σ = 42792086700. Its totient is φ = 10143309312.

The previous prime is 21554532421. The next prime is 21554532437. The reversal of 21554532424 is 42423545512.

It can be written as a sum of positive squares in 2 ways, for example, as 17191929924 + 4362602500 = 131118^2 + 66050^2 .

It is not an unprimeable number, because it can be changed into a prime (21554532421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79244469 + ... + 79244740.

Almost surely, 2^21554532424 is an apocalyptic number.

It is an amenable number.

21554532424 is a deficient number, since it is larger than the sum of its proper divisors (21237554276).

21554532424 is a wasteful number, since it uses less digits than its factorization.

21554532424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158489232 (or 158489228 counting only the distinct ones).

The product of its digits is 192000, while the sum is 37.

The spelling of 21554532424 in words is "twenty-one billion, five hundred fifty-four million, five hundred thirty-two thousand, four hundred twenty-four".