1221221111122 has 8 divisors (see below), whose sum is σ = 1841952284172. Its totient is φ = 607237016400.

The previous prime is 1221221111111. The next prime is 1221221111153. The reversal of 1221221111122 is 2211111221221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1214362124361 + 6858986761 = 1101981^2 + 82819^2 .

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

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1221221111122.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1686769129 + ... + 1686769852.

Almost surely, 2^{1221221111122} is an apocalyptic number.

1221221111122 is a deficient number, since it is larger than the sum of its proper divisors (620731173050).

1221221111122 is a wasteful number, since it uses less digits than its factorization.

1221221111122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373539164.

The product of its digits is 64, while the sum is 19.

Adding to 1221221111122 its reverse (2211111221221), we get a palindrome (3432332332343).

It can be divided in two parts, 1221 and 221111122, that multiplied together give a palindrome (269976679962).

The spelling of 1221221111122 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, one hundred twenty-two".