2021131121231 has 4 divisors (see below), whose sum is σ = 2021134093200. Its totient is φ = 2021128149264.

The previous prime is 2021131121189. The next prime is 2021131121267. The reversal of 2021131121231 is 1321211311202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2021131121231 - 2²⁶ = 2021064012367 is a prime.

It is a super-2 number, since 2×2021131121231² (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 (2021131121291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94310 + ... + 2012748.

It is an arithmetic number, because the mean of its divisors is an integer number (505283523300).

Almost surely, 2^{2021131121231} is an apocalyptic number.

2021131121231 is a deficient number, since it is larger than the sum of its proper divisors (2971969).

2021131121231 is a wasteful number, since it uses less digits than its factorization.

2021131121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2971968.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 2021131121231 its reverse (1321211311202), we get a palindrome (3342342432433).

The spelling of 2021131121231 in words is "two trillion, twenty-one billion, one hundred thirty-one million, one hundred twenty-one thousand, two hundred thirty-one".