21742346171 has 16 divisors (see below), whose sum is σ = 28168224000. Its totient is φ = 16297327008.

The previous prime is 21742346167. The next prime is 21742346183. The reversal of 21742346171 is 17164324712.

It is a cyclic number.

It is not a de Polignac number, because 21742346171 - 2² = 21742346167 is a prime.

It is a super-2 number, since 2×21742346171² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21742346111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6285821 + ... + 6289278.

It is an arithmetic number, because the mean of its divisors is an integer number (1760514000).

Almost surely, 2^21742346171 is an apocalyptic number.

21742346171 is a deficient number, since it is larger than the sum of its proper divisors (6425877829).

21742346171 is a wasteful number, since it uses less digits than its factorization.

21742346171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12575138.

The product of its digits is 56448, while the sum is 38.

The spelling of 21742346171 in words is "twenty-one billion, seven hundred forty-two million, three hundred forty-six thousand, one hundred seventy-one".