1212312012123 has 16 divisors (see below), whose sum is σ = 1672243372800. Its totient is φ = 780297292320.

The previous prime is 1212312012113. The next prime is 1212312012199. The reversal of 1212312012123 is 3212102132121.

It is not a de Polignac number, because 1212312012123 - 2²¹ = 1212309914971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212312012123.

It is not an unprimeable number, because it can be changed into a prime (1212312012113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1320108 + ... + 2041398.

It is an arithmetic number, because the mean of its divisors is an integer number (104515210800).

Almost surely, 2^{1212312012123} is an apocalyptic number.

1212312012123 is a deficient number, since it is larger than the sum of its proper divisors (459931360677).

1212312012123 is a wasteful number, since it uses less digits than its factorization.

1212312012123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740642.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1212312012123 its reverse (3212102132121), we get a palindrome (4424414144244).

The spelling of 1212312012123 in words is "one trillion, two hundred twelve billion, three hundred twelve million, twelve thousand, one hundred twenty-three".