21022573 has 8 divisors (see below), whose sum is σ = 24698016. Its totient is φ = 17641200.

The previous prime is 21022553. The next prime is 21022597. The reversal of 21022573 is 37522012.

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 21022573 - 2⁵ = 21022541 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 (21022553) 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, 73363 + ... + 73648.

It is an arithmetic number, because the mean of its divisors is an integer number (3087252).

Almost surely, 2^21022573 is an apocalyptic number.

It is an amenable number.

21022573 is a deficient number, since it is larger than the sum of its proper divisors (3675443).

21022573 is a wasteful number, since it uses less digits than its factorization.

21022573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147035.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21022573 is about 4585.0379496794. The cubic root of 21022573 is about 275.9912349313.

Adding to 21022573 its reverse (37522012), we get a palindrome (58544585).

The spelling of 21022573 in words is "twenty-one million, twenty-two thousand, five hundred seventy-three".