2221212121231 has 8 divisors (see below), whose sum is σ = 2351925064224. Its totient is φ = 2090505112320.

The previous prime is 2221212121213. The next prime is 2221212121253. The reversal of 2221212121231 is 1321212121222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2221212121231 - 2⁵ = 2221212121199 is a prime.

It is a super-2 number, since 2×2221212121231² (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 (2221212121211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701070 + ... + 2221243.

It is an arithmetic number, because the mean of its divisors is an integer number (293990633028).

Almost surely, 2^{2221212121231} is an apocalyptic number.

2221212121231 is a deficient number, since it is larger than the sum of its proper divisors (130712942993).

2221212121231 is a wasteful number, since it uses less digits than its factorization.

2221212121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967041.

The product of its digits is 384, while the sum is 22.

Adding to 2221212121231 its reverse (1321212121222), we get a palindrome (3542424242453).

Subtracting from 2221212121231 its reverse (1321212121222), we obtain a palindrome (900000000009).

The spelling of 2221212121231 in words is "two trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, two hundred thirty-one".