21622064 has 20 divisors (see below), whose sum is σ = 42016656. Its totient is φ = 10779072.

The previous prime is 21622061. The next prime is 21622099. The reversal of 21622064 is 46022612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4157 + ... + 7779.

Almost surely, 2^21622064 is an apocalyptic number.

It is an amenable number.

21622064 is a deficient number, since it is larger than the sum of its proper divisors (20394592).

21622064 is a wasteful number, since it uses less digits than its factorization.

21622064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004 (or 3998 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 21622064 is about 4649.9531180432. The cubic root of 21622064 is about 278.5901236882.

Adding to 21622064 its reverse (46022612), we get a palindrome (67644676).

The spelling of 21622064 in words is "twenty-one million, six hundred twenty-two thousand, sixty-four".