11111302031221 has 4 divisors (see below), whose sum is σ = 12698630892832. Its totient is φ = 9523973169612.

The previous prime is 11111302031213. The next prime is 11111302031227. The reversal of 11111302031221 is 12213020311111.

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 11111302031221 - 2³ = 11111302031213 is a prime.

It is a super-2 number, since 2×11111302031221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111302031227) 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, 793664430795 + ... + 793664430808.

It is an arithmetic number, because the mean of its divisors is an integer number (3174657723208).

Almost surely, 2^{11111302031221} is an apocalyptic number.

It is an amenable number.

11111302031221 is a deficient number, since it is larger than the sum of its proper divisors (1587328861611).

11111302031221 is an equidigital number, since it uses as much as digits as its factorization.

11111302031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587328861610.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 11111302031221 its reverse (12213020311111), we get a palindrome (23324322342332).

The spelling of 11111302031221 in words is "eleven trillion, one hundred eleven billion, three hundred two million, thirty-one thousand, two hundred twenty-one".