21650573 has 8 divisors (see below), whose sum is σ = 24810240. Its totient is φ = 18507600.

The previous prime is 21650569. The next prime is 21650599. The reversal of 21650573 is 37505612.

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 21650573 - 2² = 21650569 is a prime.

It is a super-2 number, since 2×21650573² = 937494622456658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650533) 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, 1253 + ... + 6698.

It is an arithmetic number, because the mean of its divisors is an integer number (3101280).

Almost surely, 2^21650573 is an apocalyptic number.

It is an amenable number.

21650573 is a deficient number, since it is larger than the sum of its proper divisors (3159667).

21650573 is an equidigital number, since it uses as much as digits as its factorization.

21650573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8347.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 21650573 is about 4653.0176230055. The cubic root of 21650573 is about 278.7125115987.

The spelling of 21650573 in words is "twenty-one million, six hundred fifty thousand, five hundred seventy-three".