1221100222022 has 16 divisors (see below), whose sum is σ = 1928083910400. Its totient is φ = 578406616200.

The previous prime is 1221100222021. The next prime is 1221100222031. The reversal of 1221100222022 is 2202220011221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221100222021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2535479 + ... + 2978397.

It is an arithmetic number, because the mean of its divisors is an integer number (120505244400).

Almost surely, 2^{1221100222022} is an apocalyptic number.

1221100222022 is a deficient number, since it is larger than the sum of its proper divisors (706983688378).

1221100222022 is a wasteful number, since it uses less digits than its factorization.

1221100222022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515491.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1221100222022 its reverse (2202220011221), we get a palindrome (3423320233243).

The spelling of 1221100222022 in words is "one trillion, two hundred twenty-one billion, one hundred million, two hundred twenty-two thousand, twenty-two".