21160261475 has 12 divisors (see below), whose sum is σ = 26255041296. Its totient is φ = 16917682080.

The previous prime is 21160261459. The next prime is 21160261477. The reversal of 21160261475 is 57416206112.

It is not a de Polignac number, because 21160261475 - 2⁴ = 21160261459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21160261477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222047 + ... + 302696.

It is an arithmetic number, because the mean of its divisors is an integer number (2187920108).

Almost surely, 2^21160261475 is an apocalyptic number.

21160261475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21160261475 is a deficient number, since it is larger than the sum of its proper divisors (5094779821).

21160261475 is a wasteful number, since it uses less digits than its factorization.

21160261475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526366 (or 526361 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

Adding to 21160261475 its reverse (57416206112), we get a palindrome (78576467587).

The spelling of 21160261475 in words is "twenty-one billion, one hundred sixty million, two hundred sixty-one thousand, four hundred seventy-five".