21849136 has 10 divisors (see below), whose sum is σ = 42332732. Its totient is φ = 10924560.

The previous prime is 21849127. The next prime is 21849137. The reversal of 21849136 is 63194812.

It is not an unprimeable number, because it can be changed into a prime (21849137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 682770 + ... + 682801.

Almost surely, 2^21849136 is an apocalyptic number.

It is an amenable number.

21849136 is a deficient number, since it is larger than the sum of its proper divisors (20483596).

21849136 is a wasteful number, since it uses less digits than its factorization.

21849136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365579 (or 1365573 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 21849136 is about 4674.3059377837. The cubic root of 21849136 is about 279.5619681618.

The spelling of 21849136 in words is "twenty-one million, eight hundred forty-nine thousand, one hundred thirty-six".