1221221111022 has 48 divisors (see below), whose sum is σ = 2953651079808. Its totient is φ = 361460791440.

The previous prime is 1221221110937. The next prime is 1221221111053. The reversal of 1221221111022 is 2201111221221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1221221110986 and 1221221111004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71709898 + ... + 71726925.

It is an arithmetic number, because the mean of its divisors is an integer number (61534397496).

Almost surely, 2^{1221221111022} is an apocalyptic number.

1221221111022 is an abundant number, since it is smaller than the sum of its proper divisors (1732429968786).

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

1221221111022 is a wasteful number, since it uses less digits than its factorization.

1221221111022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143436885 (or 143436882 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221221111022 its reverse (2201111221221), we get a palindrome (3422332332243).

The spelling of 1221221111022 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, twenty-two".