11211220219984 has 40 divisors (see below), whose sum is σ = 23210493082920. Its totient is φ = 5227465863168.

The previous prime is 11211220219939. The next prime is 11211220219987. The reversal of 11211220219984 is 48991202211211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6931783277584 + 4279436942400 = 2632828^2 + 2068680^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 11211220219984.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211220219987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189042469 + ... + 189101764.

It is an arithmetic number, because the mean of its divisors is an integer number (580262327073).

Almost surely, 2^{11211220219984} is an apocalyptic number.

It is an amenable number.

11211220219984 is an abundant number, since it is smaller than the sum of its proper divisors (11999272862936).

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

11211220219984 is a wasteful number, since it uses less digits than its factorization.

11211220219984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378144367 (or 378144361 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 43.

The spelling of 11211220219984 in words is "eleven trillion, two hundred eleven billion, two hundred twenty million, two hundred nineteen thousand, nine hundred eighty-four".