2121221211231 has 4 divisors (see below), whose sum is σ = 2828294948312. Its totient is φ = 1414147474152.

The previous prime is 2121221211223. The next prime is 2121221211247. The reversal of 2121221211231 is 1321121221212.

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

It is not a de Polignac number, because 2121221211231 - 2³ = 2121221211223 is a prime.

It is a super-2 number, since 2×2121221211231² (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 = 2121221211198 and 2121221211207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121221211281) 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, 353536868536 + ... + 353536868541.

It is an arithmetic number, because the mean of its divisors is an integer number (707073737078).

Almost surely, 2^{2121221211231} is an apocalyptic number.

2121221211231 is a deficient number, since it is larger than the sum of its proper divisors (707073737081).

2121221211231 is an equidigital number, since it uses as much as digits as its factorization.

2121221211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707073737080.

The product of its digits is 192, while the sum is 21.

Adding to 2121221211231 its reverse (1321121221212), we get a palindrome (3442342432443).

The spelling of 2121221211231 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred thirty-one".