21163743228 has 24 divisors (see below), whose sum is σ = 49594014288. Its totient is φ = 7024302976.

The previous prime is 21163743197. The next prime is 21163743233. The reversal of 21163743228 is 82234736112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3781851 + ... + 3787442.

It is an arithmetic number, because the mean of its divisors is an integer number (2066417262).

Almost surely, 2^21163743228 is an apocalyptic number.

It is an amenable number.

21163743228 is an abundant number, since it is smaller than the sum of its proper divisors (28430271060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21163743228 is a wasteful number, since it uses less digits than its factorization.

21163743228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7569533 (or 7569531 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The spelling of 21163743228 in words is "twenty-one billion, one hundred sixty-three million, seven hundred forty-three thousand, two hundred twenty-eight".