21700042672605 has 16 divisors (see below), whose sum is σ = 37876438119744. Its totient is φ = 10521232810880.

The previous prime is 21700042672459. The next prime is 21700042672619. The reversal of 21700042672605 is 50627624000712.

It is not a de Polignac number, because 21700042672605 - 2¹⁰ = 21700042671581 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 65757704904 + ... + 65757705233.

It is an arithmetic number, because the mean of its divisors is an integer number (2367277382484).

Almost surely, 2^{21700042672605} is an apocalyptic number.

It is an amenable number.

21700042672605 is a deficient number, since it is larger than the sum of its proper divisors (16176395447139).

21700042672605 is a wasteful number, since it uses less digits than its factorization.

21700042672605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131515410156.

The product of its (nonzero) digits is 282240, while the sum is 42.

The spelling of 21700042672605 in words is "twenty-one trillion, seven hundred billion, forty-two million, six hundred seventy-two thousand, six hundred five".