2111621388 has 12 divisors (see below), whose sum is σ = 4927116600. Its totient is φ = 703873792.

The previous prime is 2111621377. The next prime is 2111621429. The reversal of 2111621388 is 8831261112.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 87984213 + ... + 87984236.

It is an arithmetic number, because the mean of its divisors is an integer number (410593050).

Almost surely, 2^2111621388 is an apocalyptic number.

It is an amenable number.

2111621388 is an abundant number, since it is smaller than the sum of its proper divisors (2815495212).

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

2111621388 is a wasteful number, since it uses less digits than its factorization.

2111621388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175968456 (or 175968454 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 2111621388 is about 45952.3817445843. The cubic root of 2111621388 is about 1282.9370600562.

The spelling of 2111621388 in words is "two billion, one hundred eleven million, six hundred twenty-one thousand, three hundred eighty-eight".