1231000121233 has 4 divisors (see below), whose sum is σ = 1231008444900. Its totient is φ = 1230991797568.

The previous prime is 1231000121231. The next prime is 1231000121291. The reversal of 1231000121233 is 3321210001321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 409424658769 + 821575462464 = 639863^2 + 906408^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231000121233 - 2¹ = 1231000121231 is a prime.

It is a super-2 number, since 2×1231000121233² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231000121233.

It is not an unprimeable number, because it can be changed into a prime (1231000121231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3935908 + ... + 4237141.

It is an arithmetic number, because the mean of its divisors is an integer number (307752111225).

Almost surely, 2^{1231000121233} is an apocalyptic number.

It is an amenable number.

1231000121233 is a deficient number, since it is larger than the sum of its proper divisors (8323667).

1231000121233 is an equidigital number, since it uses as much as digits as its factorization.

1231000121233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8323666.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1231000121233 its reverse (3321210001321), we get a palindrome (4552210122554).

The spelling of 1231000121233 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-one thousand, two hundred thirty-three".