1221130123 has 8 divisors (see below), whose sum is σ = 1244896128. Its totient is φ = 1197391104.

The previous prime is 1221130121. The next prime is 1221130153. The reversal of 1221130123 is 3210311221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221130123 - 2¹ = 1221130121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221130097 and 1221130106.

It is not an unprimeable number, because it can be changed into a prime (1221130121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101190 + ... + 112612.

It is an arithmetic number, because the mean of its divisors is an integer number (155612016).

Almost surely, 2^1221130123 is an apocalyptic number.

1221130123 is a deficient number, since it is larger than the sum of its proper divisors (23766005).

1221130123 is a wasteful number, since it uses less digits than its factorization.

1221130123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13493.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1221130123 is about 34944.6723120993. The cubic root of 1221130123 is about 1068.8595654894.

Adding to 1221130123 its reverse (3210311221), we get a palindrome (4431441344).

The spelling of 1221130123 in words is "one billion, two hundred twenty-one million, one hundred thirty thousand, one hundred twenty-three".