21041427 has 16 divisors (see below), whose sum is σ = 32406912. Its totient is φ = 12001920.

The previous prime is 21041411. The next prime is 21041429. The reversal of 21041427 is 72414012.

It is a happy number.

It is not a de Polignac number, because 21041427 - 2⁴ = 21041411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21041429) 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, 18193 + ... + 19314.

It is an arithmetic number, because the mean of its divisors is an integer number (2025432).

Almost surely, 2^21041427 is an apocalyptic number.

21041427 is a deficient number, since it is larger than the sum of its proper divisors (11365485).

21041427 is a wasteful number, since it uses less digits than its factorization.

21041427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37538.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 21041427 is about 4587.0935242264. The cubic root of 21041427 is about 276.0737174439.

Adding to 21041427 its reverse (72414012), we get a palindrome (93455439).

The spelling of 21041427 in words is "twenty-one million, forty-one thousand, four hundred twenty-seven".