21069501 has 8 divisors (see below), whose sum is σ = 28144320. Its totient is φ = 14020512.

The previous prime is 21069487. The next prime is 21069547. The reversal of 21069501 is 10596012.

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

It is not a de Polignac number, because 21069501 - 2¹⁰ = 21068477 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21069101) 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, 4465 + ... + 7878.

It is an arithmetic number, because the mean of its divisors is an integer number (3518040).

Almost surely, 2^21069501 is an apocalyptic number.

It is an amenable number.

21069501 is a deficient number, since it is larger than the sum of its proper divisors (7074819).

21069501 is a wasteful number, since it uses less digits than its factorization.

21069501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12915.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 21069501 is about 4590.1526118420. The cubic root of 21069501 is about 276.1964443726.

The spelling of 21069501 in words is "twenty-one million, sixty-nine thousand, five hundred one".