1221111212202 has 48 divisors (see below), whose sum is σ = 3201568898112. Its totient is φ = 328366039680.

The previous prime is 1221111212197. The next prime is 1221111212203. The reversal of 1221111212202 is 2022121111221.

It is a super-2 number, since 2×1221111212202² (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 not an unprimeable number, because it can be changed into a prime (1221111212203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285037824 + ... + 285042107.

It is an arithmetic number, because the mean of its divisors is an integer number (66699352044).

Almost surely, 2^{1221111212202} is an apocalyptic number.

1221111212202 is an abundant number, since it is smaller than the sum of its proper divisors (1980457685910).

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

1221111212202 is a wasteful number, since it uses less digits than its factorization.

1221111212202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570079963 (or 570079960 counting only the distinct ones).

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

Adding to 1221111212202 its reverse (2022121111221), we get a palindrome (3243232323423).

The spelling of 1221111212202 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twelve thousand, two hundred two".