21725730774461 has 32 divisors (see below), whose sum is σ = 25363355351040. Its totient is φ = 18225464040000.

The previous prime is 21725730774431. The next prime is 21725730774497. The reversal of 21725730774461 is 16447703752712.

It is not a de Polignac number, because 21725730774461 - 2²⁶ = 21725663665597 is a prime.

It is a super-3 number, since 3×21725730774461³ (a number of 41 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21725730774397 and 21725730774406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21725730774421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 819794711 + ... + 819821211.

It is an arithmetic number, because the mean of its divisors is an integer number (792604854720).

Almost surely, 2^{21725730774461} is an apocalyptic number.

It is an amenable number.

21725730774461 is a deficient number, since it is larger than the sum of its proper divisors (3637624576579).

21725730774461 is a wasteful number, since it uses less digits than its factorization.

21725730774461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38585.

The product of its (nonzero) digits is 13829760, while the sum is 56.

The spelling of 21725730774461 in words is "twenty-one trillion, seven hundred twenty-five billion, seven hundred thirty million, seven hundred seventy-four thousand, four hundred sixty-one".