21632041 has 8 divisors (see below), whose sum is σ = 23181984. Its totient is φ = 20112960.

The previous prime is 21631997. The next prime is 21632059. The reversal of 21632041 is 14023612.

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 21632041 - 2¹⁹ = 21107753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21632071) 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, 6255 + ... + 9076.

It is an arithmetic number, because the mean of its divisors is an integer number (2897748).

Almost surely, 2^21632041 is an apocalyptic number.

It is an amenable number.

21632041 is a deficient number, since it is larger than the sum of its proper divisors (1549943).

21632041 is a wasteful number, since it uses less digits than its factorization.

21632041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15431.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21632041 is about 4651.0258008315. The cubic root of 21632041 is about 278.6329667498.

Subtracting from 21632041 its product of nonzero digits (288), we obtain a triangular number (21631753 = T₆₅₇₇).

Adding to 21632041 its reverse (14023612), we get a palindrome (35655653).

The spelling of 21632041 in words is "twenty-one million, six hundred thirty-two thousand, forty-one".