21361160 has 16 divisors (see below), whose sum is σ = 48062700. Its totient is φ = 8544448.

The previous prime is 21361147. The next prime is 21361169. The reversal of 21361160 is 6116312.

It can be written as a sum of positive squares in 2 ways, for example, as 21215236 + 145924 = 4606^2 + 382^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (21361169) 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, 266975 + ... + 267054.

Almost surely, 2^21361160 is an apocalyptic number.

21361160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21361160 is an abundant number, since it is smaller than the sum of its proper divisors (26701540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21361160 is a wasteful number, since it uses less digits than its factorization.

21361160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534040 (or 534036 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21361160 is about 4621.8134968863. The cubic root of 21361160 is about 277.4650444296.

Adding to 21361160 its reverse (6116312), we get a palindrome (27477472).

The spelling of 21361160 in words is "twenty-one million, three hundred sixty-one thousand, one hundred sixty".