21642243661422 has 24 divisors (see below), whose sum is σ = 48930290018064. Its totient is φ = 6900425515104.

The previous prime is 21642243661387. The next prime is 21642243661429. The reversal of 21642243661422 is 22416634224612.

21642243661422 is a `hidden beast` number, since 2 + 1 + 6 + 4 + 2 + 2 + 4 + 3 + 6 + 614 + 22 = 666.

It is a super-4 number, since 4×21642243661422⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21642243661429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26137975023 + ... + 26137975850.

It is an arithmetic number, because the mean of its divisors is an integer number (2038762084086).

Almost surely, 2^{21642243661422} is an apocalyptic number.

21642243661422 is an abundant number, since it is smaller than the sum of its proper divisors (27288046356642).

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

21642243661422 is a wasteful number, since it uses less digits than its factorization.

21642243661422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52275950904 (or 52275950901 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 45.

The spelling of 21642243661422 in words is "twenty-one trillion, six hundred forty-two billion, two hundred forty-three million, six hundred sixty-one thousand, four hundred twenty-two".