21203554324 has 12 divisors (see below), whose sum is σ = 37107276948. Its totient is φ = 10601475200.

The previous prime is 21203554223. The next prime is 21203554357. The reversal of 21203554324 is 42345530212.

It can be written as a sum of positive squares in 2 ways, for example, as 9296816400 + 11906737924 = 96420^2 + 109118^2 .

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, 174444 + ... + 269884.

It is an arithmetic number, because the mean of its divisors is an integer number (3092273079).

Almost surely, 2^21203554324 is an apocalyptic number.

It is an amenable number.

21203554324 is a deficient number, since it is larger than the sum of its proper divisors (15903722624).

21203554324 is a wasteful number, since it uses less digits than its factorization.

21203554324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150986 (or 150984 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 21203554324 in words is "twenty-one billion, two hundred three million, five hundred fifty-four thousand, three hundred twenty-four".