21954422848 has 28 divisors (see below), whose sum is σ = 44628393852. Its totient is φ = 10709473280.

The previous prime is 21954422843. The next prime is 21954422909. The reversal of 21954422848 is 84822445912.

It can be written as a sum of positive squares in 2 ways, for example, as 8370054144 + 13584368704 = 91488^2 + 116552^2 .

It is a super-2 number, since 2×21954422848² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21954422843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4180765 + ... + 4186012.

It is an arithmetic number, because the mean of its divisors is an integer number (1593871209).

Almost surely, 2^21954422848 is an apocalyptic number.

It is an amenable number.

21954422848 is an abundant number, since it is smaller than the sum of its proper divisors (22673971004).

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

21954422848 is an equidigital number, since it uses as much as digits as its factorization.

21954422848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8366830 (or 8366820 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 49.

The spelling of 21954422848 in words is "twenty-one billion, nine hundred fifty-four million, four hundred twenty-two thousand, eight hundred forty-eight".