1221101022222 has 40 divisors (see below), whose sum is σ = 2747619309600. Its totient is φ = 405330591456.

The previous prime is 1221101022209. The next prime is 1221101022259. The reversal of 1221101022222 is 2222201011221.

It is a happy number.

It is a super-2 number, since 2×1221101022222² (a number of 25 digits) contains 22 as substring.

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 = 1221101022195 and 1221101022204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15730447 + ... + 15807882.

It is an arithmetic number, because the mean of its divisors is an integer number (68690482740).

Almost surely, 2^{1221101022222} is an apocalyptic number.

1221101022222 is an abundant number, since it is smaller than the sum of its proper divisors (1526518287378).

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

1221101022222 is a wasteful number, since it uses less digits than its factorization.

1221101022222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31538582 (or 31538573 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221101022222 its reverse (2222201011221), we get a palindrome (3443302033443).

The spelling of 1221101022222 in words is "one trillion, two hundred twenty-one billion, one hundred one million, twenty-two thousand, two hundred twenty-two".