1231122121 has 8 divisors (see below), whose sum is σ = 1265411840. Its totient is φ = 1197089712.

The previous prime is 1231122097. The next prime is 1231122187. The reversal of 1231122121 is 1212211321.

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 1231122121 - 2²¹ = 1229024969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231122095 and 1231122104.

It is not an unprimeable number, because it can be changed into a prime (1231122421) 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, 54606 + ... + 73783.

It is an arithmetic number, because the mean of its divisors is an integer number (158176480).

Almost surely, 2^1231122121 is an apocalyptic number.

It is an amenable number.

1231122121 is a deficient number, since it is larger than the sum of its proper divisors (34289719).

1231122121 is a wasteful number, since it uses less digits than its factorization.

1231122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128655.

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

The square root of 1231122121 is about 35087.3498714280. The cubic root of 1231122121 is about 1071.7669936261.

Adding to 1231122121 its reverse (1212211321), we get a palindrome (2443333442).

The spelling of 1231122121 in words is "one billion, two hundred thirty-one million, one hundred twenty-two thousand, one hundred twenty-one".