11211122220020 has 48 divisors (see below), whose sum is σ = 24357429930960. Its totient is φ = 4329415673856.

The previous prime is 11211122220017. The next prime is 11211122220059. The reversal of 11211122220020 is 2002222111211.

It can be written as a sum of positive squares in 8 ways, for example, as 44858392804 + 11166263827216 = 211798^2 + 3341596^2 .

It is a super-2 number, since 2×11211122220020² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5483564 + ... + 7245116.

It is an arithmetic number, because the mean of its divisors is an integer number (507446456895).

Almost surely, 2^{11211122220020} is an apocalyptic number.

11211122220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211122220020 is an abundant number, since it is smaller than the sum of its proper divisors (13146307710940).

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

11211122220020 is a wasteful number, since it uses less digits than its factorization.

11211122220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772564 (or 1772562 counting only the distinct ones).

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

Adding to 11211122220020 its reverse (2002222111211), we get a palindrome (13213344331231).

The spelling of 11211122220020 in words is "eleven trillion, two hundred eleven billion, one hundred twenty-two million, two hundred twenty thousand, twenty".