1221200011123 has 2 divisors, whose sum is σ = 1221200011124. Its totient is φ = 1221200011122.

The previous prime is 1221200011063. The next prime is 1221200011133. The reversal of 1221200011123 is 3211100021221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221200011123 - 2¹⁷ = 1221199880051 is a prime.

It is a super-2 number, since 2×1221200011123² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221200011097 and 1221200011106.

It is not a weakly prime, because it can be changed into another prime (1221200011133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600005561 + 610600005562.

It is an arithmetic number, because the mean of its divisors is an integer number (610600005562).

Almost surely, 2^{1221200011123} is an apocalyptic number.

1221200011123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221200011123 is an equidigital number, since it uses as much as digits as its factorization.

1221200011123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1221200011123 its reverse (3211100021221), we get a palindrome (4432300032344).

The spelling of 1221200011123 in words is "one trillion, two hundred twenty-one billion, two hundred million, eleven thousand, one hundred twenty-three".