21710541 has 8 divisors (see below), whose sum is σ = 29021184. Its totient is φ = 14436800.

The previous prime is 21710537. The next prime is 21710567. The reversal of 21710541 is 14501712.

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 21710541 - 2² = 21710537 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21711541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7821 + ... + 10226.

It is an arithmetic number, because the mean of its divisors is an integer number (3627648).

Almost surely, 2^21710541 is an apocalyptic number.

It is an amenable number.

21710541 is a deficient number, since it is larger than the sum of its proper divisors (7310643).

21710541 is a wasteful number, since it uses less digits than its factorization.

21710541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18451.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 21710541 is about 4659.4571572234. The cubic root of 21710541 is about 278.9696013951.

The spelling of 21710541 in words is "twenty-one million, seven hundred ten thousand, five hundred forty-one".