21060239 has 8 divisors (see below), whose sum is σ = 21958992. Its totient is φ = 20180160.

The previous prime is 21060211. The next prime is 21060257. The reversal of 21060239 is 93206012.

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 21060239 - 2¹² = 21056143 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 (21060209) 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, 2342 + ... + 6899.

It is an arithmetic number, because the mean of its divisors is an integer number (2744874).

Almost surely, 2^21060239 is an apocalyptic number.

21060239 is a deficient number, since it is larger than the sum of its proper divisors (898753).

21060239 is an equidigital number, since it uses as much as digits as its factorization.

21060239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9337.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 21060239 is about 4589.1436020242. The cubic root of 21060239 is about 276.1559671221.

The spelling of 21060239 in words is "twenty-one million, sixty thousand, two hundred thirty-nine".