2121310033231 has 4 divisors (see below), whose sum is σ = 2124302008600. Its totient is φ = 2118318057864.

The previous prime is 2121310033153. The next prime is 2121310033243. The reversal of 2121310033231 is 1323300131212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121310033231 - 2¹³ = 2121310025039 is a prime.

It is a super-2 number, since 2×2121310033231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121314033231) 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, 1495986621 + ... + 1495988038.

It is an arithmetic number, because the mean of its divisors is an integer number (531075502150).

Almost surely, 2^{2121310033231} is an apocalyptic number.

2121310033231 is a deficient number, since it is larger than the sum of its proper divisors (2991975369).

2121310033231 is an equidigital number, since it uses as much as digits as its factorization.

2121310033231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991975368.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 2121310033231 its reverse (1323300131212), we get a palindrome (3444610164443).

The spelling of 2121310033231 in words is "two trillion, one hundred twenty-one billion, three hundred ten million, thirty-three thousand, two hundred thirty-one".