21232861 has 32 divisors (see below), whose sum is σ = 25804800. Its totient is φ = 17288640.

The previous prime is 21232829. The next prime is 21232867. The reversal of 21232861 is 16823212.

It is a cyclic number.

It is not a de Polignac number, because 21232861 - 2⁵ = 21232829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232867) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 359850 + ... + 359908.

It is an arithmetic number, because the mean of its divisors is an integer number (806400).

Almost surely, 2^21232861 is an apocalyptic number.

It is an amenable number.

21232861 is a deficient number, since it is larger than the sum of its proper divisors (4571939).

21232861 is a wasteful number, since it uses less digits than its factorization.

21232861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169.

The product of its digits is 1152, while the sum is 25.

The square root of 21232861 is about 4607.9128680998. The cubic root of 21232861 is about 276.9084267673.

The spelling of 21232861 in words is "twenty-one million, two hundred thirty-two thousand, eight hundred sixty-one".