2121001203231 has 12 divisors (see below), whose sum is σ = 3121473469608. Its totient is φ = 1387321541424.

The previous prime is 2121001203227. The next prime is 2121001203239. The reversal of 2121001203231 is 1323021001212.

2121001203231 is a `hidden beast` number, since 21 + 210 + 0 + 1 + 203 + 231 = 666.

It is not a de Polignac number, because 2121001203231 - 2² = 2121001203227 is a prime.

It is a super-2 number, since 2×2121001203231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121001203239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2223271225 + ... + 2223272178.

It is an arithmetic number, because the mean of its divisors is an integer number (260122789134).

Almost surely, 2^{2121001203231} is an apocalyptic number.

2121001203231 is a deficient number, since it is larger than the sum of its proper divisors (1000472266377).

2121001203231 is a wasteful number, since it uses less digits than its factorization.

2121001203231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4446543462 (or 4446543459 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 2121001203231 its reverse (1323021001212), we get a palindrome (3444022204443).

It can be divided in two parts, 2121001 and 203231, that added together give a palindrome (2324232).

The spelling of 2121001203231 in words is "two trillion, one hundred twenty-one billion, one million, two hundred three thousand, two hundred thirty-one".