21899348 has 12 divisors (see below), whose sum is σ = 38366580. Its totient is φ = 10937472.

The previous prime is 21899333. The next prime is 21899363. The reversal of 21899348 is 84399812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21899333) and next prime (21899363).

It can be written as a sum of positive squares in 2 ways, for example, as 17455684 + 4443664 = 4178^2 + 2108^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21899299 and 21899308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1868 + ... + 6876.

It is an arithmetic number, because the mean of its divisors is an integer number (3197215).

Almost surely, 2^21899348 is an apocalyptic number.

It is an amenable number.

21899348 is a deficient number, since it is larger than the sum of its proper divisors (16467232).

21899348 is a wasteful number, since it uses less digits than its factorization.

21899348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6106 (or 6104 counting only the distinct ones).

The product of its digits is 124416, while the sum is 44.

The square root of 21899348 is about 4679.6739202641. The cubic root of 21899348 is about 279.7759602400.

The spelling of 21899348 in words is "twenty-one million, eight hundred ninety-nine thousand, three hundred forty-eight".