21736489488 has 80 divisors (see below), whose sum is σ = 64190939136. Its totient is φ = 6208824960.

The previous prime is 21736489477. The next prime is 21736489517. The reversal of 21736489488 is 88498463712.

It is a happy number.

It is a Cunningham number, because it is equal to 147433²-1.

It is a super-5 number, since 5×21736489488⁵ (a number of 53 digits) contains 55555 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2058783 + ... + 2069313.

Almost surely, 2^21736489488 is an apocalyptic number.

21736489488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21736489488 is an abundant number, since it is smaller than the sum of its proper divisors (42454449648).

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

21736489488 is a wasteful number, since it uses less digits than its factorization.

21736489488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16692 (or 16686 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 60.

The spelling of 21736489488 in words is "twenty-one billion, seven hundred thirty-six million, four hundred eighty-nine thousand, four hundred eighty-eight".