21710549 has 16 divisors (see below), whose sum is σ = 25522560. Its totient is φ = 18083520.

The previous prime is 21710537. The next prime is 21710567. The reversal of 21710549 is 94501712.

It is not a de Polignac number, because 21710549 - 2²⁴ = 4933333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21710519) 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 15 ways as a sum of consecutive naturals, for example, 51359 + ... + 51779.

It is an arithmetic number, because the mean of its divisors is an integer number (1595160).

Almost surely, 2^21710549 is an apocalyptic number.

It is an amenable number.

21710549 is a deficient number, since it is larger than the sum of its proper divisors (3812011).

21710549 is a wasteful number, since it uses less digits than its factorization.

21710549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 21710549 is about 4659.4580156924. The cubic root of 21710549 is about 278.9696356604.

The spelling of 21710549 in words is "twenty-one million, seven hundred ten thousand, five hundred forty-nine".