11220312131 has 4 divisors (see below), whose sum is σ = 12823213872. Its totient is φ = 9617410392.

The previous prime is 11220312121. The next prime is 11220312133. The reversal of 11220312131 is 13121302211.

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 11220312131 - 2²² = 11216117827 is a prime.

It is a super-2 number, since 2×11220312131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11220312133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 801450860 + ... + 801450873.

It is an arithmetic number, because the mean of its divisors is an integer number (3205803468).

Almost surely, 2^11220312131 is an apocalyptic number.

11220312131 is a deficient number, since it is larger than the sum of its proper divisors (1602901741).

11220312131 is an equidigital number, since it uses as much as digits as its factorization.

11220312131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602901740.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11220312131 its reverse (13121302211), we get a palindrome (24341614342).

The spelling of 11220312131 in words is "eleven billion, two hundred twenty million, three hundred twelve thousand, one hundred thirty-one".