1231110021222 has 12 divisors (see below), whose sum is σ = 2667405046020. Its totient is φ = 410370007068.

The previous prime is 1231110021209. The next prime is 1231110021223. The reversal of 1231110021222 is 2221200111321.

1231110021222 is a `hidden beast` number, since 12 + 311 + 100 + 21 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 68395001179 = 1231110021222 / (1 + 2 + 3 + 1 + 1 + 1 + 0 + 0 + 2 + 1 + 2 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 1231110021195 and 1231110021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231110021223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34197500572 + ... + 34197500607.

It is an arithmetic number, because the mean of its divisors is an integer number (222283753835).

Almost surely, 2^{1231110021222} is an apocalyptic number.

1231110021222 is an abundant number, since it is smaller than the sum of its proper divisors (1436295024798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231110021222 is a wasteful number, since it uses less digits than its factorization.

1231110021222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68395001187 (or 68395001184 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1231110021222 its reverse (2221200111321), we get a palindrome (3452310132543).

Subtracting 1231110021222 from its reverse (2221200111321), we obtain a palindrome (990090090099).

The spelling of 1231110021222 in words is "one trillion, two hundred thirty-one billion, one hundred ten million, twenty-one thousand, two hundred twenty-two".