21050727 has 16 divisors (see below), whose sum is σ = 30831360. Its totient is φ = 12716352.

The previous prime is 21050707. The next prime is 21050737. The reversal of 21050727 is 72705012.

It is not a de Polignac number, because 21050727 - 2¹⁰ = 21049703 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21050697 and 21050706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6718 + ... + 9339.

It is an arithmetic number, because the mean of its divisors is an integer number (1926960).

Almost surely, 2^21050727 is an apocalyptic number.

21050727 is a deficient number, since it is larger than the sum of its proper divisors (9780633).

21050727 is a wasteful number, since it uses less digits than its factorization.

21050727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16102.

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 21050727 is about 4588.1071260379. The cubic root of 21050727 is about 276.1143849551.

Adding to 21050727 its reverse (72705012), we get a palindrome (93755739).

The spelling of 21050727 in words is "twenty-one million, fifty thousand, seven hundred twenty-seven".