231402021 has 8 divisors (see below), whose sum is σ = 308606304. Its totient is φ = 154232880.

The previous prime is 231402019. The next prime is 231402037. The reversal of 231402021 is 120204132.

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

It is not a de Polignac number, because 231402021 - 2¹ = 231402019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231403021) 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, 21411 + ... + 30351.

It is an arithmetic number, because the mean of its divisors is an integer number (38575788).

Almost surely, 2^231402021 is an apocalyptic number.

It is an amenable number.

231402021 is a deficient number, since it is larger than the sum of its proper divisors (77204283).

231402021 is an equidigital number, since it uses as much as digits as its factorization.

231402021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17571.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 231402021 is about 15211.9039242299. The cubic root of 231402021 is about 613.9349853529.

Adding to 231402021 its reverse (120204132), we get a palindrome (351606153).

The spelling of 231402021 in words is "two hundred thirty-one million, four hundred two thousand, twenty-one".