21246231 has 8 divisors (see below), whose sum is σ = 28393200. Its totient is φ = 14131712.

The previous prime is 21246229. The next prime is 21246263. The reversal of 21246231 is 13264212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21246231 - 2¹ = 21246229 is a prime.

It is a super-2 number, since 2×21246231² = 902804663410722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21246198 and 21246207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6540 + ... + 9233.

It is an arithmetic number, because the mean of its divisors is an integer number (3549150).

Almost surely, 2^21246231 is an apocalyptic number.

21246231 is a deficient number, since it is larger than the sum of its proper divisors (7146969).

21246231 is a wasteful number, since it uses less digits than its factorization.

21246231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16225.

The product of its digits is 576, while the sum is 21.

The square root of 21246231 is about 4609.3634050702. The cubic root of 21246231 is about 276.9665362052.

The spelling of 21246231 in words is "twenty-one million, two hundred forty-six thousand, two hundred thirty-one".