21422680 has 32 divisors (see below), whose sum is σ = 48560400. Its totient is φ = 8505216.

The previous prime is 21422641. The next prime is 21422689. The reversal of 21422680 is 8622412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3634 + ... + 7486.

Almost surely, 2^21422680 is an apocalyptic number.

21422680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21422680 is an abundant number, since it is smaller than the sum of its proper divisors (27137720).

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

21422680 is a wasteful number, since it uses less digits than its factorization.

21422680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003 (or 3999 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 21422680 is about 4628.4641081032. The cubic root of 21422680 is about 277.7311549603.

The spelling of 21422680 in words is "twenty-one million, four hundred twenty-two thousand, six hundred eighty".