21929024488 has 40 divisors (see below), whose sum is σ = 47966928930. Its totient is φ = 9398145120.

The previous prime is 21929024471. The next prime is 21929024521. The reversal of 21929024488 is 88442092912.

It can be written as a sum of positive squares in only one way, i.e., 21869085924 + 59938564 = 147882^2 + 7742^2 .

It is a super-2 number, since 2×21929024488² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

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 9 ways as a sum of consecutive naturals, for example, 551623 + ... + 590038.

Almost surely, 2^21929024488 is an apocalyptic number.

21929024488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21929024488 is an abundant number, since it is smaller than the sum of its proper divisors (26037904442).

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

21929024488 is an equidigital number, since it uses as much as digits as its factorization.

21929024488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141695 (or 1141670 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 49.

The spelling of 21929024488 in words is "twenty-one billion, nine hundred twenty-nine million, twenty-four thousand, four hundred eighty-eight".