21849207 has 8 divisors (see below), whose sum is σ = 29362176. Its totient is φ = 14451192.

The previous prime is 21849181. The next prime is 21849227. The reversal of 21849207 is 70294812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21849207 - 2¹⁴ = 21832823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21849227) 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, 28293 + ... + 29054.

It is an arithmetic number, because the mean of its divisors is an integer number (3670272).

Almost surely, 2^21849207 is an apocalyptic number.

21849207 is a deficient number, since it is larger than the sum of its proper divisors (7512969).

21849207 is a wasteful number, since it uses less digits than its factorization.

21849207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57477.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 21849207 is about 4674.3135324880. The cubic root of 21849207 is about 279.5622709789.

The spelling of 21849207 in words is "twenty-one million, eight hundred forty-nine thousand, two hundred seven".