21112705722 has 64 divisors (see below), whose sum is σ = 48210422400. Its totient is φ = 6121912320.

The previous prime is 21112705709. The next prime is 21112705729. The reversal of 21112705722 is 22750721112.

It is a self number, because there is not a number n which added to its sum of digits gives 21112705722.

It is not an unprimeable number, because it can be changed into a prime (21112705729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53397 + ... + 212312.

It is an arithmetic number, because the mean of its divisors is an integer number (753287850).

Almost surely, 2^21112705722 is an apocalyptic number.

21112705722 is an abundant number, since it is smaller than the sum of its proper divisors (27097716678).

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

21112705722 is a wasteful number, since it uses less digits than its factorization.

21112705722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265791.

The product of its (nonzero) digits is 3920, while the sum is 30.

The spelling of 21112705722 in words is "twenty-one billion, one hundred twelve million, seven hundred five thousand, seven hundred twenty-two".