21174582347742 has 16 divisors (see below), whose sum is σ = 42419864476800. Its totient is φ = 7046410819032.

The previous prime is 21174582347741. The next prime is 21174582347749. The reversal of 21174582347742 is 24774328547112.

It is a super-2 number, since 2×21174582347742² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21174582347741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2945820328 + ... + 2945827515.

It is an arithmetic number, because the mean of its divisors is an integer number (2651241529800).

Almost surely, 2^{21174582347742} is an apocalyptic number.

21174582347742 is an abundant number, since it is smaller than the sum of its proper divisors (21245282129058).

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

21174582347742 is a wasteful number, since it uses less digits than its factorization.

21174582347742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5891648447.

The product of its digits is 21073920, while the sum is 57.

The spelling of 21174582347742 in words is "twenty-one trillion, one hundred seventy-four billion, five hundred eighty-two million, three hundred forty-seven thousand, seven hundred forty-two".