21163612722 has 32 divisors (see below), whose sum is σ = 48378652800. Its totient is φ = 6046161408.

The previous prime is 21163612709. The next prime is 21163612753. The reversal of 21163612722 is 22721636112.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 607554 + ... + 641442.

It is an arithmetic number, because the mean of its divisors is an integer number (1511832900).

Almost surely, 2^21163612722 is an apocalyptic number.

21163612722 is an abundant number, since it is smaller than the sum of its proper divisors (27215040078).

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

21163612722 is a wasteful number, since it uses less digits than its factorization.

21163612722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48770.

The product of its digits is 12096, while the sum is 33.

The spelling of 21163612722 in words is "twenty-one billion, one hundred sixty-three million, six hundred twelve thousand, seven hundred twenty-two".