1213012321002 has 24 divisors (see below), whose sum is σ = 2630124490500. Its totient is φ = 404040343680.

The previous prime is 1213012320977. The next prime is 1213012321007. The reversal of 1213012321002 is 2001232103121.

1213012321002 is a `hidden beast` number, since 121 + 301 + 232 + 10 + 0 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1047713969241 + 165298351761 = 1023579^2 + 406569^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1213012321007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24732877 + ... + 24781872.

Almost surely, 2^{1213012321002} is an apocalyptic number.

1213012321002 is an abundant number, since it is smaller than the sum of its proper divisors (1417112169498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213012321002 is a wasteful number, since it uses less digits than its factorization.

1213012321002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49516118 (or 49516115 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1213012321002 its reverse (2001232103121), we get a palindrome (3214244424123).

The spelling of 1213012321002 in words is "one trillion, two hundred thirteen billion, twelve million, three hundred twenty-one thousand, two".