1021221221222 has 32 divisors (see below), whose sum is σ = 1580056761600. Its totient is φ = 494785866400.

The previous prime is 1021221221191. The next prime is 1021221221257. The reversal of 1021221221222 is 2221221221201.

It is a junction number, because it is equal to n+sod(n) for n = 1021221221194 and 1021221221203.

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, 56785472 + ... + 56803452.

It is an arithmetic number, because the mean of its divisors is an integer number (49376773800).

Almost surely, 2^{1021221221222} is an apocalyptic number.

1021221221222 is a deficient number, since it is larger than the sum of its proper divisors (558835540378).

1021221221222 is a wasteful number, since it uses less digits than its factorization.

1021221221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24892.

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

Adding to 1021221221222 its reverse (2221221221201), we get a palindrome (3242442442423).

The spelling of 1021221221222 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-two".