21707049 has 48 divisors (see below), whose sum is σ = 37359168. Its totient is φ = 11104128.

The previous prime is 21707041. The next prime is 21707053. The reversal of 21707049 is 94070712.

It is not a de Polignac number, because 21707049 - 2³ = 21707041 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21707041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 70554 + ... + 70860.

It is an arithmetic number, because the mean of its divisors is an integer number (778316).

Almost surely, 2^21707049 is an apocalyptic number.

It is an amenable number.

21707049 is a deficient number, since it is larger than the sum of its proper divisors (15652119).

21707049 is a wasteful number, since it uses less digits than its factorization.

21707049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 21707049 is about 4659.0824203914. The cubic root of 21707049 is about 278.9546437748.

The spelling of 21707049 in words is "twenty-one million, seven hundred seven thousand, forty-nine".