1213111030321 has 4 divisors (see below), whose sum is σ = 1213481902144. Its totient is φ = 1212740158500.

The previous prime is 1213111030223. The next prime is 1213111030337. The reversal of 1213111030321 is 1230301113121.

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 1213111030321 - 2³¹ = 1210963546673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213111030381) 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, 185431005 + ... + 185437546.

It is an arithmetic number, because the mean of its divisors is an integer number (303370475536).

Almost surely, 2^{1213111030321} is an apocalyptic number.

It is an amenable number.

1213111030321 is a deficient number, since it is larger than the sum of its proper divisors (370871823).

1213111030321 is an equidigital number, since it uses as much as digits as its factorization.

1213111030321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370871822.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1213111030321 its reverse (1230301113121), we get a palindrome (2443412143442).

The spelling of 1213111030321 in words is "one trillion, two hundred thirteen billion, one hundred eleven million, thirty thousand, three hundred twenty-one".