21760057 has 8 divisors (see below), whose sum is σ = 23864832. Its totient is φ = 19676400.

The previous prime is 21760031. The next prime is 21760069. The reversal of 21760057 is 75006712.

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 21760057 - 2⁷ = 21759929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21760097) 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, 3078 + ... + 7279.

It is an arithmetic number, because the mean of its divisors is an integer number (2983104).

Almost surely, 2^21760057 is an apocalyptic number.

It is an amenable number.

21760057 is a deficient number, since it is larger than the sum of its proper divisors (2104775).

21760057 is a wasteful number, since it uses less digits than its factorization.

21760057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10559.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 21760057 is about 4664.7676255093. The cubic root of 21760057 is about 279.1815256466.

Adding to 21760057 its reverse (75006712), we get a palindrome (96766769).

The spelling of 21760057 in words is "twenty-one million, seven hundred sixty thousand, fifty-seven".