21425171674742 has 24 divisors (see below), whose sum is σ = 35332889987808. Its totient is φ = 9736531806320.

The previous prime is 21425171674693. The next prime is 21425171674763. The reversal of 21425171674742 is 24747617152412.

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, 8838593 + ... + 10998684.

It is an arithmetic number, because the mean of its divisors is an integer number (1472203749492).

Almost surely, 2^{21425171674742} is an apocalyptic number.

21425171674742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21425171674742 is a deficient number, since it is larger than the sum of its proper divisors (13907718313066).

21425171674742 is a wasteful number, since it uses less digits than its factorization.

21425171674742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19841764 (or 19841753 counting only the distinct ones).

The product of its digits is 5268480, while the sum is 53.

The spelling of 21425171674742 in words is "twenty-one trillion, four hundred twenty-five billion, one hundred seventy-one million, six hundred seventy-four thousand, seven hundred forty-two".