21618414480 has 160 divisors (see below), whose sum is σ = 76417858944. Its totient is φ = 5008416768.

The previous prime is 21618414439. The next prime is 21618414487. The reversal of 21618414480 is 8441481612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (21618414487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150754 + ... + 256833.

Almost surely, 2^21618414480 is an apocalyptic number.

21618414480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21618414480 is an abundant number, since it is smaller than the sum of its proper divisors (54799444464).

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

21618414480 is a wasteful number, since it uses less digits than its factorization.

21618414480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407633 (or 407627 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

It can be divided in two parts, 2161841 and 4480, that added together give a triangular number (2166321 = T₂₀₈₁).

The spelling of 21618414480 in words is "twenty-one billion, six hundred eighteen million, four hundred fourteen thousand, four hundred eighty".