1221220010022 has 32 divisors (see below), whose sum is σ = 2455409700864. Its totient is φ = 404912040000.

The previous prime is 1221220009991. The next prime is 1221220010033. The reversal of 1221220010022 is 2200100221221.

It is a junction number, because it is equal to n+sod(n) for n = 1221220009983 and 1221220010010.

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, 19745647 + ... + 19807397.

It is an arithmetic number, because the mean of its divisors is an integer number (76731553152).

Almost surely, 2^{1221220010022} is an apocalyptic number.

1221220010022 is an abundant number, since it is smaller than the sum of its proper divisors (1234189690842).

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

1221220010022 is a wasteful number, since it uses less digits than its factorization.

1221220010022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79204.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1221220010022 its reverse (2200100221221), we get a palindrome (3421320231243).

It can be divided in two parts, 1221 and 220010022, that multiplied together give a palindrome (268632236862).

The spelling of 1221220010022 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, ten thousand, twenty-two".