21440725178142 has 24 divisors (see below), whose sum is σ = 45552267337176. Its totient is φ = 6726502016128.

The previous prime is 21440725178113. The next prime is 21440725178179. The reversal of 21440725178142 is 24187152704412.

It is a super-2 number, since 2×21440725178142² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21440725178091 and 21440725178100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6182444973 + ... + 6182448440.

It is an arithmetic number, because the mean of its divisors is an integer number (1898011139049).

Almost surely, 2^{21440725178142} is an apocalyptic number.

21440725178142 is an abundant number, since it is smaller than the sum of its proper divisors (24111542159034).

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

21440725178142 is a wasteful number, since it uses less digits than its factorization.

21440725178142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12364893452 (or 12364893435 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 48.

The spelling of 21440725178142 in words is "twenty-one trillion, four hundred forty billion, seven hundred twenty-five million, one hundred seventy-eight thousand, one hundred forty-two".