1213021123313 has 4 divisors (see below), whose sum is σ = 1254849437940. Its totient is φ = 1171192808688.

The previous prime is 1213021123309. The next prime is 1213021123319. The reversal of 1213021123313 is 3133211203121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 379786247824 + 833234875489 = 616268^2 + 912817^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213021123313 - 2² = 1213021123309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213021123319) 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, 20914157270 + ... + 20914157327.

It is an arithmetic number, because the mean of its divisors is an integer number (313712359485).

Almost surely, 2^{1213021123313} is an apocalyptic number.

It is an amenable number.

1213021123313 is a deficient number, since it is larger than the sum of its proper divisors (41828314627).

1213021123313 is an equidigital number, since it uses as much as digits as its factorization.

1213021123313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41828314626.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1213021123313 its reverse (3133211203121), we get a palindrome (4346232326434).

The spelling of 1213021123313 in words is "one trillion, two hundred thirteen billion, twenty-one million, one hundred twenty-three thousand, three hundred thirteen".