1212312423 has 32 divisors (see below), whose sum is σ = 1949667840. Its totient is φ = 654566400.

The previous prime is 1212312391. The next prime is 1212312427. The reversal of 1212312423 is 3242132121.

It is not a de Polignac number, because 1212312423 - 2⁵ = 1212312391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1212312423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212312427) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156211 + ... + 163787.

It is an arithmetic number, because the mean of its divisors is an integer number (60927120).

Almost surely, 2^1212312423 is an apocalyptic number.

1212312423 is a deficient number, since it is larger than the sum of its proper divisors (737355417).

1212312423 is a wasteful number, since it uses less digits than its factorization.

1212312423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8007.

The product of its digits is 576, while the sum is 21.

The square root of 1212312423 is about 34818.2771400309. The cubic root of 1212312423 is about 1066.2806265910.

Adding to 1212312423 its reverse (3242132121), we get a palindrome (4454444544).

The spelling of 1212312423 in words is "one billion, two hundred twelve million, three hundred twelve thousand, four hundred twenty-three".