1230121231 has 4 divisors (see below), whose sum is σ = 1230223464. Its totient is φ = 1230019000.

The previous prime is 1230121229. The next prime is 1230121301. The reversal of 1230121231 is 1321210321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1321210321 = 23 ⋅57443927.

It is a cyclic number.

It is not a de Polignac number, because 1230121231 - 2¹ = 1230121229 is a prime.

It is a super-2 number, since 2×1230121231² = 3026396485913910722, which 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 (1230121201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30220 + ... + 58081.

It is an arithmetic number, because the mean of its divisors is an integer number (307555866).

Almost surely, 2^1230121231 is an apocalyptic number.

1230121231 is a deficient number, since it is larger than the sum of its proper divisors (102233).

1230121231 is an equidigital number, since it uses as much as digits as its factorization.

1230121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102232.

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

The square root of 1230121231 is about 35073.0841386953. The cubic root of 1230121231 is about 1071.4764695903.

Adding to 1230121231 its reverse (1321210321), we get a palindrome (2551331552).

The spelling of 1230121231 in words is "one billion, two hundred thirty million, one hundred twenty-one thousand, two hundred thirty-one".