21160242 has 12 divisors (see below), whose sum is σ = 45847230. Its totient is φ = 7053408.

The previous prime is 21160231. The next prime is 21160261. The reversal of 21160242 is 24206112.

21160242 is a `hidden beast` number, since 21 + 1 + 602 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20439441 + 720801 = 4521^2 + 849^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1175569 = 21160242 / (2 + 1 + 1 + 6 + 0 + 2 + 4 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 587767 + ... + 587802.

Almost surely, 2^21160242 is an apocalyptic number.

21160242 is an abundant number, since it is smaller than the sum of its proper divisors (24686988).

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

21160242 is a wasteful number, since it uses less digits than its factorization.

21160242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175577 (or 1175574 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21160242 is about 4600.0263042726. The cubic root of 21160242 is about 276.5923792098.

Adding to 21160242 its reverse (24206112), we get a palindrome (45366354).

The spelling of 21160242 in words is "twenty-one million, one hundred sixty thousand, two hundred forty-two".