21989350 has 12 divisors (see below), whose sum is σ = 40900284. Its totient is φ = 8795720.

The previous prime is 21989291. The next prime is 21989369. The reversal of 21989350 is 5398912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219844 + ... + 219943.

It is an arithmetic number, because the mean of its divisors is an integer number (3408357).

Almost surely, 2^21989350 is an apocalyptic number.

21989350 is a deficient number, since it is larger than the sum of its proper divisors (18910934).

21989350 is a wasteful number, since it uses less digits than its factorization.

21989350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439799 (or 439794 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 21989350 is about 4689.2803285792. The cubic root of 21989350 is about 280.1587110420.

The spelling of 21989350 in words is "twenty-one million, nine hundred eighty-nine thousand, three hundred fifty".