21986330 has 16 divisors (see below), whose sum is σ = 40496544. Its totient is φ = 8589840.

The previous prime is 21986329. The next prime is 21986333. The reversal of 21986330 is 3368912.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21986333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25136 + ... + 25995.

It is an arithmetic number, because the mean of its divisors is an integer number (2531034).

Almost surely, 2^21986330 is an apocalyptic number.

21986330 is a deficient number, since it is larger than the sum of its proper divisors (18510214).

21986330 is a wasteful number, since it uses less digits than its factorization.

21986330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51181.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 21986330 is about 4688.9583064898. The cubic root of 21986330 is about 280.1458848626.

The spelling of 21986330 in words is "twenty-one million, nine hundred eighty-six thousand, three hundred thirty".