21972277248 has 48 divisors (see below), whose sum is σ = 58578450840. Its totient is φ = 7324090368.

The previous prime is 21972277237. The next prime is 21972277289. The reversal of 21972277248 is 84277227912.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 21972277248.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1781965 + ... + 1794252.

Almost surely, 2^21972277248 is an apocalyptic number.

It is an amenable number.

21972277248 is an abundant number, since it is smaller than the sum of its proper divisors (36606173592).

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

21972277248 is an equidigital number, since it uses as much as digits as its factorization.

21972277248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576242 (or 3576222 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 51.

The spelling of 21972277248 in words is "twenty-one billion, nine hundred seventy-two million, two hundred seventy-seven thousand, two hundred forty-eight".