11221021021220 has 48 divisors (see below), whose sum is σ = 23576522996208. Its totient is φ = 4486051123200.

The previous prime is 11221021021073. The next prime is 11221021021229. The reversal of 11221021021220 is 2212012012211.

It can be written as a sum of positive squares in 8 ways, for example, as 501368789476 + 10719652231744 = 708074^2 + 3274088^2 .

It is a super-2 number, since 2×11221021021220² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11221021021229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 420233870 + ... + 420260570.

It is an arithmetic number, because the mean of its divisors is an integer number (491177562421).

Almost surely, 2^{11221021021220} is an apocalyptic number.

11221021021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221021021220 is an abundant number, since it is smaller than the sum of its proper divisors (12355501974988).

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

11221021021220 is a wasteful number, since it uses less digits than its factorization.

11221021021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36960 (or 36958 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11221021021220 its reverse (2212012012211), we get a palindrome (13433033033431).

Subtracting from 11221021021220 its reverse (2212012012211), we obtain a palindrome (9009009009009).

The spelling of 11221021021220 in words is "eleven trillion, two hundred twenty-one billion, twenty-one million, twenty-one thousand, two hundred twenty".