231001212143221 has 8 divisors (see below), whose sum is σ = 248775866196480. Its totient is φ = 213227319524592.

The previous prime is 231001212143213. The next prime is 231001212143231. The reversal of 231001212143221 is 122341212100132.

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 231001212143221 - 2³ = 231001212143213 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 (231001212143201) 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, 189728485 + ... + 190942138.

It is an arithmetic number, because the mean of its divisors is an integer number (31096983274560).

Almost surely, 2^{231001212143221} is an apocalyptic number.

It is an amenable number.

231001212143221 is a deficient number, since it is larger than the sum of its proper divisors (17774654053259).

231001212143221 is a wasteful number, since it uses less digits than its factorization.

231001212143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380717315.

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

Adding to 231001212143221 its reverse (122341212100132), we get a palindrome (353342424243353).

The spelling of 231001212143221 in words is "two hundred thirty-one trillion, one billion, two hundred twelve million, one hundred forty-three thousand, two hundred twenty-one".