2211681388 has 24 divisors (see below), whose sum is σ = 4429555200. Its totient is φ = 946536528.

The previous prime is 2211681349. The next prime is 2211681389. The reversal of 2211681388 is 8831861122.

It is a self number, because there is not a number n which added to its sum of digits gives 2211681388.

It is not an unprimeable number, because it can be changed into a prime (2211681389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34798 + ... + 75061.

It is an arithmetic number, because the mean of its divisors is an integer number (184564800).

Almost surely, 2^2211681388 is an apocalyptic number.

2211681388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2211681388 is an abundant number, since it is smaller than the sum of its proper divisors (2217873812).

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

2211681388 is a wasteful number, since it uses less digits than its factorization.

2211681388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110589 (or 110587 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 2211681388 is about 47028.5167531361. The cubic root of 2211681388 is about 1302.8893108919.

The spelling of 2211681388 in words is "two billion, two hundred eleven million, six hundred eighty-one thousand, three hundred eighty-eight".