21160634461 has 4 divisors (see below), whose sum is σ = 21161765052. Its totient is φ = 21159503872.

The previous prime is 21160634431. The next prime is 21160634471. The reversal of 21160634461 is 16443606112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32558436 + 21128076025 = 5706^2 + 145355^2 .

It is a cyclic number.

It is not a de Polignac number, because 21160634461 - 2⁷ = 21160634333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21160634401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536740 + ... + 574813.

It is an arithmetic number, because the mean of its divisors is an integer number (5290441263).

Almost surely, 2^21160634461 is an apocalyptic number.

It is an amenable number.

21160634461 is a deficient number, since it is larger than the sum of its proper divisors (1130591).

21160634461 is a wasteful number, since it uses less digits than its factorization.

21160634461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130590.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 21160634461 in words is "twenty-one billion, one hundred sixty million, six hundred thirty-four thousand, four hundred sixty-one".