21989348 has 12 divisors (see below), whose sum is σ = 38822700. Its totient is φ = 10897152.

The previous prime is 21989291. The next prime is 21989369. The reversal of 21989348 is 84398912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3602404 + 18386944 = 1898^2 + 4288^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21989299 and 21989308.

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, 23873 + ... + 24776.

It is an arithmetic number, because the mean of its divisors is an integer number (3235225).

Almost surely, 2^21989348 is an apocalyptic number.

It is an amenable number.

21989348 is a deficient number, since it is larger than the sum of its proper divisors (16833352).

21989348 is a wasteful number, since it uses less digits than its factorization.

21989348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48766 (or 48764 counting only the distinct ones).

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

The square root of 21989348 is about 4689.2801153269. The cubic root of 21989348 is about 280.1587025482.

The spelling of 21989348 in words is "twenty-one million, nine hundred eighty-nine thousand, three hundred forty-eight".