221130311 has 4 divisors (see below), whose sum is σ = 221160072. Its totient is φ = 221100552.

The previous prime is 221130277. The next prime is 221130313. The reversal of 221130311 is 113031122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221130311 is a prime.

It is a super-2 number, since 2×221130311² = 97797228885913442, which 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 (221130313) 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, 6641 + ... + 22053.

It is an arithmetic number, because the mean of its divisors is an integer number (55290018).

Almost surely, 2^221130311 is an apocalyptic number.

221130311 is a deficient number, since it is larger than the sum of its proper divisors (29761).

221130311 is a wasteful number, since it uses less digits than its factorization.

221130311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29760.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 221130311 is about 14870.4509346556. The cubic root of 221130311 is about 604.7131677696.

Adding to 221130311 its reverse (113031122), we get a palindrome (334161433).

It can be divided in two parts, 22 and 1130311, that multiplied together give a palindrome (24866842).

The spelling of 221130311 in words is "two hundred twenty-one million, one hundred thirty thousand, three hundred eleven".