21268573 has 8 divisors (see below), whose sum is σ = 22171136. Its totient is φ = 20379600.

The previous prime is 21268567. The next prime is 21268579. The reversal of 21268573 is 37586212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21268567) and next prime (21268579).

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 21268573 - 2⁹ = 21268061 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 138 + ... + 6523.

It is an arithmetic number, because the mean of its divisors is an integer number (2771392).

Almost surely, 2^21268573 is an apocalyptic number.

It is an amenable number.

21268573 is a deficient number, since it is larger than the sum of its proper divisors (902563).

21268573 is a wasteful number, since it uses less digits than its factorization.

21268573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6795.

The product of its digits is 20160, while the sum is 34.

The square root of 21268573 is about 4611.7863133497. The cubic root of 21268573 is about 277.0635858666.

The spelling of 21268573 in words is "twenty-one million, two hundred sixty-eight thousand, five hundred seventy-three".