11011220031 has 16 divisors (see below), whose sum is σ = 17508524544. Its totient is φ = 6018554784.

The previous prime is 11011220023. The next prime is 11011220041. The reversal of 11011220031 is 13002211011.

It is not a de Polignac number, because 11011220031 - 2³ = 11011220023 is a prime.

It is a super-2 number, since 2×11011220031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11011219989 and 11011220016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011220041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11398296 + ... + 11399261.

It is an arithmetic number, because the mean of its divisors is an integer number (1094282784).

Almost surely, 2^11011220031 is an apocalyptic number.

11011220031 is a deficient number, since it is larger than the sum of its proper divisors (6497304513).

11011220031 is a wasteful number, since it uses less digits than its factorization.

11011220031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22797590.

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

Adding to 11011220031 its reverse (13002211011), we get a palindrome (24013431042).

The spelling of 11011220031 in words is "eleven billion, eleven million, two hundred twenty thousand, thirty-one".