2121201123231 has 4 divisors (see below), whose sum is σ = 2828268164312. Its totient is φ = 1414134082152.

The previous prime is 2121201123221. The next prime is 2121201123253. The reversal of 2121201123231 is 1323211021212.

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

It is not a de Polignac number, because 2121201123231 - 2¹³ = 2121201115039 is a prime.

It is a super-2 number, since 2×2121201123231² (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 = 2121201123198 and 2121201123207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121201123221) 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, 353533520536 + ... + 353533520541.

It is an arithmetic number, because the mean of its divisors is an integer number (707067041078).

Almost surely, 2^{2121201123231} is an apocalyptic number.

2121201123231 is a deficient number, since it is larger than the sum of its proper divisors (707067041081).

2121201123231 is an equidigital number, since it uses as much as digits as its factorization.

2121201123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707067041080.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 2121201123231 its reverse (1323211021212), we get a palindrome (3444412144443).

The spelling of 2121201123231 in words is "two trillion, one hundred twenty-one billion, two hundred one million, one hundred twenty-three thousand, two hundred thirty-one".