11220120031 has 4 divisors (see below), whose sum is σ = 11295423000. Its totient is φ = 11144817064.

The previous prime is 11220120017. The next prime is 11220120049. The reversal of 11220120031 is 13002102211.

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 11220120031 - 2¹³ = 11220111839 is a prime.

It is a super-2 number, since 2×11220120031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11220119993 and 11220120020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220120091) 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, 37651261 + ... + 37651558.

It is an arithmetic number, because the mean of its divisors is an integer number (2823855750).

Almost surely, 2^11220120031 is an apocalyptic number.

11220120031 is a deficient number, since it is larger than the sum of its proper divisors (75302969).

11220120031 is an equidigital number, since it uses as much as digits as its factorization.

11220120031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75302968.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 11220120031 its reverse (13002102211), we get a palindrome (24222222242).

The spelling of 11220120031 in words is "eleven billion, two hundred twenty million, one hundred twenty thousand, thirty-one".