1213133210021 has 4 divisors (see below), whose sum is σ = 1213305561600. Its totient is φ = 1212960858444.

The previous prime is 1213133210011. The next prime is 1213133210041. The reversal of 1213133210021 is 1200123313121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1213133210021 - 2³⁰ = 1212059468197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213133209975 and 1213133210002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213133210011) 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, 86165231 + ... + 86179308.

It is an arithmetic number, because the mean of its divisors is an integer number (303326390400).

Almost surely, 2^{1213133210021} is an apocalyptic number.

It is an amenable number.

1213133210021 is a deficient number, since it is larger than the sum of its proper divisors (172351579).

1213133210021 is an equidigital number, since it uses as much as digits as its factorization.

1213133210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172351578.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1213133210021 its reverse (1200123313121), we get a palindrome (2413256523142).

The spelling of 1213133210021 in words is "one trillion, two hundred thirteen billion, one hundred thirty-three million, two hundred ten thousand, twenty-one".