1221111022103 has 16 divisors (see below), whose sum is σ = 1407983776320. Its totient is φ = 1037346379776.

The previous prime is 1221111022099. The next prime is 1221111022189. The reversal of 1221111022103 is 3012201111221.

It is a happy number.

It is not a de Polignac number, because 1221111022103 - 2² = 1221111022099 is a prime.

It is a super-2 number, since 2×1221111022103² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221111022003) 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, 20264603 + ... + 20324771.

It is an arithmetic number, because the mean of its divisors is an integer number (87998986020).

Almost surely, 2^{1221111022103} is an apocalyptic number.

1221111022103 is a deficient number, since it is larger than the sum of its proper divisors (186872754217).

1221111022103 is a wasteful number, since it uses less digits than its factorization.

1221111022103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85946.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1221111022103 its reverse (3012201111221), we get a palindrome (4233312133324).

The spelling of 1221111022103 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, twenty-two thousand, one hundred three".