231201021 has 8 divisors (see below), whose sum is σ = 318898080. Its totient is φ = 148818992.

The previous prime is 231201011. The next prime is 231201023. The reversal of 231201021 is 120102132.

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 231201021 - 2⁹ = 231200509 is a prime.

It is a super-2 number, since 2×231201021² = 106907824222884882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231200988 and 231201006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231201023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1328655 + ... + 1328828.

It is an arithmetic number, because the mean of its divisors is an integer number (39862260).

Almost surely, 2^231201021 is an apocalyptic number.

It is an amenable number.

231201021 is a deficient number, since it is larger than the sum of its proper divisors (87697059).

231201021 is a wasteful number, since it uses less digits than its factorization.

231201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657515.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 231201021 is about 15205.2958208645. The cubic root of 231201021 is about 613.7571754989.

Adding to 231201021 its reverse (120102132), we get a palindrome (351303153).

The spelling of 231201021 in words is "two hundred thirty-one million, two hundred one thousand, twenty-one".