21749426928 has 30 divisors (see below), whose sum is σ = 60868188264. Its totient is φ = 7249808928.

The previous prime is 21749426899. The next prime is 21749426929. The reversal of 21749426928 is 82962494712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21749426929) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 75518700 + ... + 75518987.

Almost surely, 2^21749426928 is an apocalyptic number.

It is an amenable number.

21749426928 is an abundant number, since it is smaller than the sum of its proper divisors (39118761336).

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

21749426928 is a wasteful number, since it uses less digits than its factorization.

21749426928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151037701 (or 151037692 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The spelling of 21749426928 in words is "twenty-one billion, seven hundred forty-nine million, four hundred twenty-six thousand, nine hundred twenty-eight".