11220031 has 4 divisors (see below), whose sum is σ = 11236072. Its totient is φ = 11203992.

The previous prime is 11220029. The next prime is 11220037. The reversal of 11220031 is 13002211.

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

It is a cyclic number.

It is not a de Polignac number, because 11220031 - 2¹ = 11220029 is a prime.

It is a super-2 number, since 2×11220031² = 251778191281922, 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 (11220037) 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, 6921 + ... + 8386.

It is an arithmetic number, because the mean of its divisors is an integer number (2809018).

Almost surely, 2^11220031 is an apocalyptic number.

11220031 is a deficient number, since it is larger than the sum of its proper divisors (16041).

11220031 is an equidigital number, since it uses as much as digits as its factorization.

11220031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16040.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 11220031 is about 3349.6314722668. The cubic root of 11220031 is about 223.8710926568.

Adding to 11220031 its reverse (13002211), we get a palindrome (24222242).

The spelling of 11220031 in words is "eleven million, two hundred twenty thousand, thirty-one".