21622385 has 16 divisors (see below), whose sum is σ = 27703296. Its totient is φ = 16144128.

The previous prime is 21622339. The next prime is 21622417. The reversal of 21622385 is 58322612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21622385 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9794 + ... + 11796.

It is an arithmetic number, because the mean of its divisors is an integer number (1731456).

Almost surely, 2^21622385 is an apocalyptic number.

It is an amenable number.

21622385 is a deficient number, since it is larger than the sum of its proper divisors (6080911).

21622385 is a wasteful number, since it uses less digits than its factorization.

21622385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152.

The product of its digits is 5760, while the sum is 29.

The square root of 21622385 is about 4649.9876343922. The cubic root of 21622385 is about 278.5915023260.

Adding to 21622385 its reverse (58322612), we get a palindrome (79944997).

The spelling of 21622385 in words is "twenty-one million, six hundred twenty-two thousand, three hundred eighty-five".