21622648 has 16 divisors (see below), whose sum is σ = 40654080. Its totient is φ = 10781568.

The previous prime is 21622631. The next prime is 21622649. The reversal of 21622648 is 84622612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21622649) 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, 465 + ... + 6592.

It is an arithmetic number, because the mean of its divisors is an integer number (2540880).

Almost surely, 2^21622648 is an apocalyptic number.

It is an amenable number.

21622648 is a deficient number, since it is larger than the sum of its proper divisors (19031432).

21622648 is a wasteful number, since it uses less digits than its factorization.

21622648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7446 (or 7442 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 21622648 is about 4650.0159139513. The cubic root of 21622648 is about 278.5926318540.

The spelling of 21622648 in words is "twenty-one million, six hundred twenty-two thousand, six hundred forty-eight".