21911348 has 6 divisors (see below), whose sum is σ = 38344866. Its totient is φ = 10955672.

The previous prime is 21911347. The next prime is 21911377. The reversal of 21911348 is 84311912.

It can be written as a sum of positive squares in only one way, i.e., 20593444 + 1317904 = 4538^2 + 1148^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21911348.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21911347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2738915 + ... + 2738922.

It is an arithmetic number, because the mean of its divisors is an integer number (6390811).

Almost surely, 2^21911348 is an apocalyptic number.

It is an amenable number.

21911348 is a deficient number, since it is larger than the sum of its proper divisors (16433518).

21911348 is a wasteful number, since it uses less digits than its factorization.

21911348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5477841 (or 5477839 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 21911348 is about 4680.9558852867. The cubic root of 21911348 is about 279.8270530622.

The spelling of 21911348 in words is "twenty-one million, nine hundred eleven thousand, three hundred forty-eight".