1221101211123 has 24 divisors (see below), whose sum is σ = 1818279393840. Its totient is φ = 789307096320.

The previous prime is 1221101211107. The next prime is 1221101211131. The reversal of 1221101211123 is 3211121011221.

It is a happy number.

It is not a de Polignac number, because 1221101211123 - 2⁴ = 1221101211107 is a prime.

It is a super-2 number, since 2×1221101211123² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221101211096 and 1221101211105.

It is not an unprimeable number, because it can be changed into a prime (1221101211133) 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, 15712098 + ... + 15789623.

It is an arithmetic number, because the mean of its divisors is an integer number (75761641410).

Almost surely, 2^{1221101211123} is an apocalyptic number.

1221101211123 is a deficient number, since it is larger than the sum of its proper divisors (597178182717).

1221101211123 is a wasteful number, since it uses less digits than its factorization.

1221101211123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31501859 (or 31501856 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 1221101211123 its reverse (3211121011221), we get a palindrome (4432222222344).

The spelling of 1221101211123 in words is "one trillion, two hundred twenty-one billion, one hundred one million, two hundred eleven thousand, one hundred twenty-three".