21722209722 has 16 divisors (see below), whose sum is σ = 48271577280. Its totient is φ = 7240736556.

The previous prime is 21722209711. The next prime is 21722209727. The reversal of 21722209722 is 22790222712.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21722209727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201131518 + ... + 201131625.

It is an arithmetic number, because the mean of its divisors is an integer number (3016973580).

Almost surely, 2^21722209722 is an apocalyptic number.

21722209722 is an abundant number, since it is smaller than the sum of its proper divisors (26549367558).

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

21722209722 is a wasteful number, since it uses less digits than its factorization.

21722209722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402263154 (or 402263148 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 21722209722 in words is "twenty-one billion, seven hundred twenty-two million, two hundred nine thousand, seven hundred twenty-two".