21241164 has 48 divisors (see below), whose sum is σ = 59628800. Its totient is φ = 5749056.

The previous prime is 21241163. The next prime is 21241217. The reversal of 21241164 is 46114212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21241164.

It is not an unprimeable number, because it can be changed into a prime (21241163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5059 + ... + 8250.

Almost surely, 2^21241164 is an apocalyptic number.

It is an amenable number.

21241164 is an abundant number, since it is smaller than the sum of its proper divisors (38387636).

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

21241164 is a wasteful number, since it uses less digits than its factorization.

21241164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13342 (or 13340 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 21241164 is about 4608.8137302347. The cubic root of 21241164 is about 276.9445165974.

Adding to 21241164 its reverse (46114212), we get a palindrome (67355376).

The spelling of 21241164 in words is "twenty-one million, two hundred forty-one thousand, one hundred sixty-four".