1231532212123 has 4 divisors (see below), whose sum is σ = 1231688090448. Its totient is φ = 1231376333800.

The previous prime is 1231532212091. The next prime is 1231532212159. The reversal of 1231532212123 is 3212122351321.

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

It is a cyclic number.

It is not a de Polignac number, because 1231532212123 - 2⁵ = 1231532212091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1231532212091 and 1231532212100.

It is not an unprimeable number, because it can be changed into a prime (1231532242123) 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, 77927311 + ... + 77943112.

It is an arithmetic number, because the mean of its divisors is an integer number (307922022612).

Almost surely, 2^{1231532212123} is an apocalyptic number.

1231532212123 is a deficient number, since it is larger than the sum of its proper divisors (155878325).

1231532212123 is an equidigital number, since it uses as much as digits as its factorization.

1231532212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155878324.

The product of its digits is 4320, while the sum is 28.

Adding to 1231532212123 its reverse (3212122351321), we get a palindrome (4443654563444).

The spelling of 1231532212123 in words is "one trillion, two hundred thirty-one billion, five hundred thirty-two million, two hundred twelve thousand, one hundred twenty-three".