21382207 has 8 divisors (see below), whose sum is σ = 26658432. Its totient is φ = 16661400.

The previous prime is 21382181. The next prime is 21382241. The reversal of 21382207 is 70228312.

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

It is not a de Polignac number, because 21382207 - 2¹⁹ = 20857919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21382247) 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, 138769 + ... + 138922.

It is an arithmetic number, because the mean of its divisors is an integer number (3332304).

Almost surely, 2^21382207 is an apocalyptic number.

21382207 is a deficient number, since it is larger than the sum of its proper divisors (5276225).

21382207 is a wasteful number, since it uses less digits than its factorization.

21382207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277709.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21382207 is about 4624.0898563934. The cubic root of 21382207 is about 277.5561426325.

The spelling of 21382207 in words is "twenty-one million, three hundred eighty-two thousand, two hundred seven".