2221212231231 has 16 divisors (see below), whose sum is σ = 3384948774144. Its totient is φ = 1269172473984.

The previous prime is 2221212231149. The next prime is 2221212231241. The reversal of 2221212231231 is 1321322121222.

It is not a de Polignac number, because 2221212231231 - 2⁹ = 2221212230719 is a prime.

It is a super-2 number, since 2×2221212231231² (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 (2221212231241) 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 15 ways as a sum of consecutive naturals, for example, 3520821 + ... + 4103486.

It is an arithmetic number, because the mean of its divisors is an integer number (211559298384).

Almost surely, 2^{2221212231231} is an apocalyptic number.

2221212231231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2221212231231 is a deficient number, since it is larger than the sum of its proper divisors (1163736542913).

2221212231231 is a wasteful number, since it uses less digits than its factorization.

2221212231231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7638190.

The product of its digits is 1152, while the sum is 24.

Adding to 2221212231231 its reverse (1321322121222), we get a palindrome (3542534352453).

The spelling of 2221212231231 in words is "two trillion, two hundred twenty-one billion, two hundred twelve million, two hundred thirty-one thousand, two hundred thirty-one".