1221021122222 has 32 divisors (see below), whose sum is σ = 2032707830400. Its totient is φ = 545385623200.

The previous prime is 1221021122219. The next prime is 1221021122257. The reversal of 1221021122222 is 2222211201221.

It is a junction number, because it is equal to n+sod(n) for n = 1221021122194 and 1221021122203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3099404 + ... + 3471072.

It is an arithmetic number, because the mean of its divisors is an integer number (63522119700).

Almost surely, 2^{1221021122222} is an apocalyptic number.

1221021122222 is a deficient number, since it is larger than the sum of its proper divisors (811686708178).

1221021122222 is a wasteful number, since it uses less digits than its factorization.

1221021122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374272.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1221021122222 its reverse (2222211201221), we get a palindrome (3443232323443).

The spelling of 1221021122222 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty-two".