21622045 has 8 divisors (see below), whose sum is σ = 27472824. Its totient is φ = 16280064.

The previous prime is 21622037. The next prime is 21622061. The reversal of 21622045 is 54022612.

It can be written as a sum of positive squares in 4 ways, for example, as 11655396 + 9966649 = 3414^2 + 3157^2 .

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 21622045 - 2³ = 21622037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127104 + ... + 127273.

It is an arithmetic number, because the mean of its divisors is an integer number (3434103).

Almost surely, 2^21622045 is an apocalyptic number.

It is an amenable number.

21622045 is a deficient number, since it is larger than the sum of its proper divisors (5850779).

21622045 is a wasteful number, since it uses less digits than its factorization.

21622045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254399.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21622045 is about 4649.9510750114. The cubic root of 21622045 is about 278.5900420861.

Adding to 21622045 its reverse (54022612), we get a palindrome (75644657).

The spelling of 21622045 in words is "twenty-one million, six hundred twenty-two thousand, forty-five".