21440041421440 has 64 divisors (see below), whose sum is σ = 51436212881760. Its totient is φ = 8545712550912.

The previous prime is 21440041421423. The next prime is 21440041421473. The reversal of 21440041421440 is 4412414004412.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59006274 + ... + 59368513.

Almost surely, 2^{21440041421440} is an apocalyptic number.

21440041421440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21440041421440 is an abundant number, since it is smaller than the sum of its proper divisors (29996171460320).

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

21440041421440 is a wasteful number, since it uses less digits than its factorization.

21440041421440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118375089 (or 118375077 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 31.

Adding to 21440041421440 its reverse (4412414004412), we get a palindrome (25852455425852).

The spelling of 21440041421440 in words is "twenty-one trillion, four hundred forty billion, forty-one million, four hundred twenty-one thousand, four hundred forty".