21442515140421 has 48 divisors (see below), whose sum is σ = 32216681410368. Its totient is φ = 14251870684800.

The previous prime is 21442515140363. The next prime is 21442515140441. The reversal of 21442515140421 is 12404151524412.

It is a happy number.

21442515140421 is a `hidden beast` number, since 2 + 1 + 4 + 42 + 5 + 151 + 40 + 421 = 666.

It is not a de Polignac number, because 21442515140421 - 2²⁵ = 21442481585989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442515140441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 160651305 + ... + 160784721.

It is an arithmetic number, because the mean of its divisors is an integer number (671180862716).

Almost surely, 2^{21442515140421} is an apocalyptic number.

It is an amenable number.

21442515140421 is a deficient number, since it is larger than the sum of its proper divisors (10774166269947).

21442515140421 is a wasteful number, since it uses less digits than its factorization.

21442515140421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135424 (or 135412 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

Adding to 21442515140421 its reverse (12404151524412), we get a palindrome (33846666664833).

The spelling of 21442515140421 in words is "twenty-one trillion, four hundred forty-two billion, five hundred fifteen million, one hundred forty thousand, four hundred twenty-one".