1221111110202 has 32 divisors (see below), whose sum is σ = 2629710878400. Its totient is φ = 376600566528.

The previous prime is 1221111110123. The next prime is 1221111110207. The reversal of 1221111110202 is 2020111111221.

It is a happy number.

It is a super-2 number, since 2×1221111110202² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221111110207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101448877 + ... + 101460912.

It is an arithmetic number, because the mean of its divisors is an integer number (82178464950).

Almost surely, 2^{1221111110202} is an apocalyptic number.

1221111110202 is an abundant number, since it is smaller than the sum of its proper divisors (1408599768198).

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

1221111110202 is a wasteful number, since it uses less digits than its factorization.

1221111110202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202909870.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221111110202 its reverse (2020111111221), we get a palindrome (3241222221423).

The spelling of 1221111110202 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, two hundred two".