21042527 has 8 divisors (see below), whose sum is σ = 23345280. Its totient is φ = 18804760.

The previous prime is 21042491. The next prime is 21042533. The reversal of 21042527 is 72524012.

It is a happy number.

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 21042527 - 2¹² = 21038431 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042577) 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, 15563 + ... + 16860.

It is an arithmetic number, because the mean of its divisors is an integer number (2918160).

Almost surely, 2^21042527 is an apocalyptic number.

21042527 is a deficient number, since it is larger than the sum of its proper divisors (2302753).

21042527 is a wasteful number, since it uses less digits than its factorization.

21042527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32493.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 21042527 is about 4587.2134242915. The cubic root of 21042527 is about 276.0785282044.

Adding to 21042527 its reverse (72524012), we get a palindrome (93566539).

The spelling of 21042527 in words is "twenty-one million, forty-two thousand, five hundred twenty-seven".