21498974272 has 28 divisors (see below), whose sum is σ = 43466977836. Its totient is φ = 10546664960.

The previous prime is 21498974267. The next prime is 21498974279. The reversal of 21498974272 is 27247989412.

It can be written as a sum of positive squares in 2 ways, for example, as 5586665536 + 15912308736 = 74744^2 + 126144^2 .

It is not an unprimeable number, because it can be changed into a prime (21498974279) 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, 3165679 + ... + 3172462.

Almost surely, 2^21498974272 is an apocalyptic number.

It is an amenable number.

21498974272 is an abundant number, since it is smaller than the sum of its proper divisors (21968003564).

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

21498974272 is an equidigital number, since it uses as much as digits as its factorization.

21498974272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6338206 (or 6338196 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 55.

The spelling of 21498974272 in words is "twenty-one billion, four hundred ninety-eight million, nine hundred seventy-four thousand, two hundred seventy-two".