231214021 has 4 divisors (see below), whose sum is σ = 243383200. Its totient is φ = 219044844.

The previous prime is 231214019. The next prime is 231214043. The reversal of 231214021 is 120412132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 231214021 - 2¹ = 231214019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231213986 and 231214004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231214421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6084561 + ... + 6084598.

It is an arithmetic number, because the mean of its divisors is an integer number (60845800).

Almost surely, 2^231214021 is an apocalyptic number.

It is an amenable number.

231214021 is a deficient number, since it is larger than the sum of its proper divisors (12169179).

231214021 is a wasteful number, since it uses less digits than its factorization.

231214021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12169178.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 231214021 is about 15205.7232974956. The cubic root of 231214021 is about 613.7686787551.

Adding to 231214021 its reverse (120412132), we get a palindrome (351626153).

The spelling of 231214021 in words is "two hundred thirty-one million, two hundred fourteen thousand, twenty-one".