11012131220 has 48 divisors (see below), whose sum is σ = 23226162960. Its totient is φ = 4385719296.

The previous prime is 11012131217. The next prime is 11012131223. The reversal of 11012131220 is 2213121011.

It is an interprime number because it is at equal distance from previous prime (11012131217) and next prime (11012131223).

It can be written as a sum of positive squares in 8 ways, for example, as 1406596 + 11010724624 = 1186^2 + 104932^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11012131195 and 11012131204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012131223) 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, 7705466 + ... + 7706894.

It is an arithmetic number, because the mean of its divisors is an integer number (483878395).

Almost surely, 2^11012131220 is an apocalyptic number.

11012131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11012131220 is an abundant number, since it is smaller than the sum of its proper divisors (12214031740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11012131220 is a wasteful number, since it uses less digits than its factorization.

11012131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844 (or 2842 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 11012131220 its reverse (2213121011), we get a palindrome (13225252231).

The spelling of 11012131220 in words is "eleven billion, twelve million, one hundred thirty-one thousand, two hundred twenty".