21057068 has 6 divisors (see below), whose sum is σ = 36849876. Its totient is φ = 10528532.

The previous prime is 21057061. The next prime is 21057083. The reversal of 21057068 is 86075012.

It is a super-2 number, since 2×21057068² = 886800225513248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21057068.

It is not an unprimeable number, because it can be changed into a prime (21057061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2632130 + ... + 2632137.

It is an arithmetic number, because the mean of its divisors is an integer number (6141646).

Almost surely, 2^21057068 is an apocalyptic number.

It is an amenable number.

21057068 is a deficient number, since it is larger than the sum of its proper divisors (15792808).

21057068 is a wasteful number, since it uses less digits than its factorization.

21057068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5264271 (or 5264269 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 21057068 is about 4588.7980997207. The cubic root of 21057068 is about 276.1421063341.

The spelling of 21057068 in words is "twenty-one million, fifty-seven thousand, sixty-eight".