11211535443220 has 72 divisors (see below), whose sum is σ = 27390287919456. Its totient is φ = 3843659082816.

The previous prime is 11211535443161. The next prime is 11211535443271. The reversal of 11211535443220 is 2234453511211.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 12489487 + ... + 13357033.

It is an arithmetic number, because the mean of its divisors is an integer number (380420665548).

Almost surely, 2^{11211535443220} is an apocalyptic number.

11211535443220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11211535443220 is an abundant number, since it is smaller than the sum of its proper divisors (16178752476236).

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

11211535443220 is a wasteful number, since it uses less digits than its factorization.

11211535443220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880757 (or 880748 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 11211535443220 its reverse (2234453511211), we get a palindrome (13445988954431).

The spelling of 11211535443220 in words is "eleven trillion, two hundred eleven billion, five hundred thirty-five million, four hundred forty-three thousand, two hundred twenty".