21072335 has 8 divisors (see below), whose sum is σ = 25360560. Its totient is φ = 16808704.

The previous prime is 21072329. The next prime is 21072361. The reversal of 21072335 is 53327012.

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 21072335 - 2¹⁸ = 20810191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21072335.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4205 + ... + 7734.

It is an arithmetic number, because the mean of its divisors is an integer number (3170070).

Almost surely, 2^21072335 is an apocalyptic number.

21072335 is a deficient number, since it is larger than the sum of its proper divisors (4288225).

21072335 is a wasteful number, since it uses less digits than its factorization.

21072335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12297.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 21072335 is about 4590.4613057949. The cubic root of 21072335 is about 276.2088272893.

Adding to 21072335 its reverse (53327012), we get a palindrome (74399347).

The spelling of 21072335 in words is "twenty-one million, seventy-two thousand, three hundred thirty-five".