231321121001 has 4 divisors (see below), whose sum is σ = 236963099604. Its totient is φ = 225679142400.

The previous prime is 231321120959. The next prime is 231321121007. The reversal of 231321121001 is 100121123132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103603515625 + 127717605376 = 321875^2 + 357376^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231321121001 is a prime.

It is a super-2 number, since 2×231321121001² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231321121007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2820989240 + ... + 2820989321.

It is an arithmetic number, because the mean of its divisors is an integer number (59240774901).

Almost surely, 2^231321121001 is an apocalyptic number.

It is an amenable number.

231321121001 is a deficient number, since it is larger than the sum of its proper divisors (5641978603).

231321121001 is an equidigital number, since it uses as much as digits as its factorization.

231321121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5641978602.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 231321121001 its reverse (100121123132), we get a palindrome (331442244133).

The spelling of 231321121001 in words is "two hundred thirty-one billion, three hundred twenty-one million, one hundred twenty-one thousand, one".