11303213221 has 4 divisors (see below), whose sum is σ = 11898119200. Its totient is φ = 10708307244.

The previous prime is 11303213203. The next prime is 11303213231. The reversal of 11303213221 is 12231230311.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12231230311 = 3023 ⋅4046057.

It is a cyclic number.

It is not a de Polignac number, because 11303213221 - 2⁷ = 11303213093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 594905959 = 11303213221 / (1 + 1 + 3 + 0 + 3 + 2 + 1 + 3 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11303213231) 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, 297452961 + ... + 297452998.

It is an arithmetic number, because the mean of its divisors is an integer number (2974529800).

Almost surely, 2^11303213221 is an apocalyptic number.

It is an amenable number.

11303213221 is a deficient number, since it is larger than the sum of its proper divisors (594905979).

11303213221 is an equidigital number, since it uses as much as digits as its factorization.

11303213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594905978.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 11303213221 its reverse (12231230311), we get a palindrome (23534443532).

It can be divided in two parts, 113032 and 13221, that added together give a triangular number (126253 = T₅₀₂).

The spelling of 11303213221 in words is "eleven billion, three hundred three million, two hundred thirteen thousand, two hundred twenty-one".