21146553265411 has 6 divisors (see below), whose sum is σ = 24599051757780. Its totient is φ = 18125617084596.

The previous prime is 21146553265391. The next prime is 21146553265423. The reversal of 21146553265411 is 11456235564112.

It is not a de Polignac number, because 21146553265411 - 2⁵ = 21146553265379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21146553265451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215781155721 + ... + 215781155818.

It is an arithmetic number, because the mean of its divisors is an integer number (4099841959630).

Almost surely, 2^{21146553265411} is an apocalyptic number.

21146553265411 is a deficient number, since it is larger than the sum of its proper divisors (3452498492369).

21146553265411 is an equidigital number, since it uses as much as digits as its factorization.

21146553265411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431562311553 (or 431562311546 counting only the distinct ones).

The product of its digits is 864000, while the sum is 46.

The spelling of 21146553265411 in words is "twenty-one trillion, one hundred forty-six billion, five hundred fifty-three million, two hundred sixty-five thousand, four hundred eleven".