21268570 has 8 divisors (see below), whose sum is σ = 38283444. Its totient is φ = 8507424.

The previous prime is 21268567. The next prime is 21268579. The reversal of 21268570 is 7586212.

It can be written as a sum of positive squares in 2 ways, for example, as 21132409 + 136161 = 4597^2 + 369^2 .

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

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (21268579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063419 + ... + 1063438.

Almost surely, 2^21268570 is an apocalyptic number.

21268570 is a deficient number, since it is larger than the sum of its proper divisors (17014874).

21268570 is a wasteful number, since it uses less digits than its factorization.

21268570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126864.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 21268570 is about 4611.7859880962. The cubic root of 21268570 is about 277.0635728397.

The spelling of 21268570 in words is "twenty-one million, two hundred sixty-eight thousand, five hundred seventy".