1221111002200 has 48 divisors (see below), whose sum is σ = 2839213178280. Its totient is φ = 488422018560.

The previous prime is 1221111002161. The next prime is 1221111002203. The reversal of 1221111002200 is 22001111221.

It is a super-2 number, since 2×1221111002200² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221111002203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4643439 + ... + 4899361.

Almost surely, 2^{1221111002200} is an apocalyptic number.

1221111002200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221111002200 is an abundant number, since it is smaller than the sum of its proper divisors (1618102176080).

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

1221111002200 is a wasteful number, since it uses less digits than its factorization.

1221111002200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279796 (or 279787 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221111002200 its reverse (22001111221), we get a palindrome (1243112113421).

The spelling of 1221111002200 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, two thousand, two hundred".