21336456040 has 64 divisors (see below), whose sum is σ = 48598295760. Its totient is φ = 8429875200.

The previous prime is 21336456019. The next prime is 21336456041. The reversal of 21336456040 is 4065463312.

It can be written as a sum of positive squares in 8 ways, for example, as 12960911716 + 8375544324 = 113846^2 + 91518^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21336455987 and 21336456005.

It is not an unprimeable number, because it can be changed into a prime (21336456041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1743222 + ... + 1755418.

Almost surely, 2^21336456040 is an apocalyptic number.

21336456040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21336456040 is an abundant number, since it is smaller than the sum of its proper divisors (27261839720).

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

21336456040 is a wasteful number, since it uses less digits than its factorization.

21336456040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12742 (or 12738 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 21336456040 in words is "twenty-one billion, three hundred thirty-six million, four hundred fifty-six thousand, forty".