21073207 has 8 divisors (see below), whose sum is σ = 21530880. Its totient is φ = 20619000.

The previous prime is 21073201. The next prime is 21073253. The reversal of 21073207 is 70237012.

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

It is a cyclic number.

It is not a de Polignac number, because 21073207 - 2¹⁹ = 20548919 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 (21073201) 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, 14098 + ... + 15520.

It is an arithmetic number, because the mean of its divisors is an integer number (2691360).

Almost surely, 2^21073207 is an apocalyptic number.

21073207 is a deficient number, since it is larger than the sum of its proper divisors (457673).

21073207 is a wasteful number, since it uses less digits than its factorization.

21073207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 21073207 is about 4590.5562843734. The cubic root of 21073207 is about 276.2126371942.

The spelling of 21073207 in words is "twenty-one million, seventy-three thousand, two hundred seven".