21709222940 has 48 divisors (see below), whose sum is σ = 46784031840. Its totient is φ = 8458494720.

The previous prime is 21709222933. The next prime is 21709222981. The reversal of 21709222940 is 4922290712.

It is a junction number, because it is equal to n+sod(n) for n = 21709222894 and 21709222903.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73670 + ... + 221010.

It is an arithmetic number, because the mean of its divisors is an integer number (974667330).

Almost surely, 2^21709222940 is an apocalyptic number.

21709222940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is a pronic number, being equal to 147340×147341.

It is an amenable number.

21709222940 is an abundant number, since it is smaller than the sum of its proper divisors (25074808900).

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

21709222940 is a wasteful number, since it uses less digits than its factorization.

21709222940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147542 (or 147540 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 21709222940 in words is "twenty-one billion, seven hundred nine million, two hundred twenty-two thousand, nine hundred forty".