1221111110002 has 48 divisors (see below), whose sum is σ = 2148805677312. Its totient is φ = 518908572000.

The previous prime is 1221111109987. The next prime is 1221111110003. The reversal of 1221111110002 is 2000111111221.

It is a happy number.

It is a super-2 number, since 2×1221111110002² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221111110003) 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, 5374048 + ... + 5596660.

It is an arithmetic number, because the mean of its divisors is an integer number (44766784944).

Almost surely, 2^{1221111110002} is an apocalyptic number.

1221111110002 is a deficient number, since it is larger than the sum of its proper divisors (927694567310).

1221111110002 is a wasteful number, since it uses less digits than its factorization.

1221111110002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223103 (or 223096 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221111110002 its reverse (2000111111221), we get a palindrome (3221222221223).

The spelling of 1221111110002 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, one hundred ten thousand, two".