21457059 has 8 divisors (see below), whose sum is σ = 30810192. Its totient is φ = 13204320.

The previous prime is 21457057. The next prime is 21457067. The reversal of 21457059 is 95075412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21457059 - 2¹ = 21457057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21457057) 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, 275052 + ... + 275129.

It is an arithmetic number, because the mean of its divisors is an integer number (3851274).

Almost surely, 2^21457059 is an apocalyptic number.

21457059 is a deficient number, since it is larger than the sum of its proper divisors (9353133).

21457059 is a wasteful number, since it uses less digits than its factorization.

21457059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550197.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 21457059 is about 4632.1764862751. The cubic root of 21457059 is about 277.8796427054.

The spelling of 21457059 in words is "twenty-one million, four hundred fifty-seven thousand, fifty-nine".