21204653569440 has 192 divisors, whose sum is σ = 74836276824960. Its totient is φ = 5001589002240.

The previous prime is 21204653569339. The next prime is 21204653569447. The reversal of 21204653569440 is 4496535640212.

It is not an unprimeable number, because it can be changed into a prime (21204653569447) 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, 54075355 + ... + 54466074.

It is an arithmetic number, because the mean of its divisors is an integer number (389772275130).

Almost surely, 2^{21204653569440} is an apocalyptic number.

21204653569440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21204653569440 is an abundant number, since it is smaller than the sum of its proper divisors (53631623255520).

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

21204653569440 is a wasteful number, since it uses less digits than its factorization.

21204653569440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108541495 (or 108541487 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 51.

The spelling of 21204653569440 in words is "twenty-one trillion, two hundred four billion, six hundred fifty-three million, five hundred sixty-nine thousand, four hundred forty".