21540460174735 has 16 divisors (see below), whose sum is σ = 25875435819456. Its totient is φ = 17214454672128.

The previous prime is 21540460174661. The next prime is 21540460174759. The reversal of 21540460174735 is 53747106404512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21540460174735 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18790987 + ... + 19904323.

It is an arithmetic number, because the mean of its divisors is an integer number (1617214738716).

Almost surely, 2^{21540460174735} is an apocalyptic number.

21540460174735 is a deficient number, since it is larger than the sum of its proper divisors (4334975644721).

21540460174735 is a wasteful number, since it uses less digits than its factorization.

21540460174735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117362.

The product of its (nonzero) digits is 2822400, while the sum is 49.

The spelling of 21540460174735 in words is "twenty-one trillion, five hundred forty billion, four hundred sixty million, one hundred seventy-four thousand, seven hundred thirty-five".