2121132320231 has 4 divisors (see below), whose sum is σ = 2121225789000. Its totient is φ = 2121038851464.

The previous prime is 2121132320183. The next prime is 2121132320243. The reversal of 2121132320231 is 1320232311212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121132320231 is a prime.

It is a super-2 number, since 2×2121132320231² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121132320197 and 2121132320206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121192320231) 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, 46700336 + ... + 46745733.

It is an arithmetic number, because the mean of its divisors is an integer number (530306447250).

Almost surely, 2^{2121132320231} is an apocalyptic number.

2121132320231 is a deficient number, since it is larger than the sum of its proper divisors (93468769).

2121132320231 is an equidigital number, since it uses as much as digits as its factorization.

2121132320231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93468768.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 2121132320231 its reverse (1320232311212), we get a palindrome (3441364631443).

The spelling of 2121132320231 in words is "two trillion, one hundred twenty-one billion, one hundred thirty-two million, three hundred twenty thousand, two hundred thirty-one".