21758330461 has 32 divisors (see below), whose sum is σ = 25664905728. Its totient is φ = 18061854720.

The previous prime is 21758330459. The next prime is 21758330471. The reversal of 21758330461 is 16403385712.

It is not a de Polignac number, because 21758330461 - 2¹ = 21758330459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21758330411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11779440 + ... + 11781286.

It is an arithmetic number, because the mean of its divisors is an integer number (802028304).

Almost surely, 2^21758330461 is an apocalyptic number.

It is an amenable number.

21758330461 is a deficient number, since it is larger than the sum of its proper divisors (3906575267).

21758330461 is a wasteful number, since it uses less digits than its factorization.

21758330461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2301.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 21758330461 in words is "twenty-one billion, seven hundred fifty-eight million, three hundred thirty thousand, four hundred sixty-one".