21422646 has 24 divisors (see below), whose sum is σ = 53046864. Its totient is φ = 6120720.

The previous prime is 21422641. The next prime is 21422689. The reversal of 21422646 is 64622412.

21422646 is a `hidden beast` number, since 2 + 14 + 2 + 2 + 646 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84885 + ... + 85136.

It is an arithmetic number, because the mean of its divisors is an integer number (2210286).

Almost surely, 2^21422646 is an apocalyptic number.

21422646 is an abundant number, since it is smaller than the sum of its proper divisors (31624218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21422646 is a wasteful number, since it uses less digits than its factorization.

21422646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170036 (or 170033 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 21422646 is about 4628.4604351771. The cubic root of 21422646 is about 277.7310080310.

The spelling of 21422646 in words is "twenty-one million, four hundred twenty-two thousand, six hundred forty-six".