21069235 has 8 divisors (see below), whose sum is σ = 27581616. Its totient is φ = 15323040.

The previous prime is 21069229. The next prime is 21069253. The reversal of 21069235 is 53296012.

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

It is not a de Polignac number, because 21069235 - 2⁷ = 21069107 is a prime.

It is a Duffinian 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, 191484 + ... + 191593.

It is an arithmetic number, because the mean of its divisors is an integer number (3447702).

Almost surely, 2^21069235 is an apocalyptic number.

21069235 is a deficient number, since it is larger than the sum of its proper divisors (6512381).

21069235 is a wasteful number, since it uses less digits than its factorization.

21069235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383093.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 21069235 is about 4590.1236366791. The cubic root of 21069235 is about 276.1952820517.

The spelling of 21069235 in words is "twenty-one million, sixty-nine thousand, two hundred thirty-five".