21797459488 has 36 divisors (see below), whose sum is σ = 49920078222. Its totient is φ = 9341767680.

The previous prime is 21797459459. The next prime is 21797459503. The reversal of 21797459488 is 88495479712.

It can be written as a sum of positive squares in only one way, i.e., 16452679824 + 5344779664 = 128268^2 + 73108^2 .

It is a super-4 number, since 4×21797459488⁴ (a number of 42 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6949153 + ... + 6952288.

Almost surely, 2^21797459488 is an apocalyptic number.

21797459488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21797459488 is an abundant number, since it is smaller than the sum of its proper divisors (28122618734).

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

21797459488 is a wasteful number, since it uses less digits than its factorization.

21797459488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13901465 (or 13901450 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 64.

The spelling of 21797459488 in words is "twenty-one billion, seven hundred ninety-seven million, four hundred fifty-nine thousand, four hundred eighty-eight".