21628626 has 8 divisors (see below), whose sum is σ = 43257264. Its totient is φ = 7209540.

The previous prime is 21628603. The next prime is 21628627. The reversal of 21628626 is 62682612.

It is a sphenic number, since it is the product of 3 distinct primes.

21628626 is an admirable number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21628627) 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, 1802380 + ... + 1802391.

It is an arithmetic number, because the mean of its divisors is an integer number (5407158).

Almost surely, 2^21628626 is an apocalyptic number.

21628626 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21628626 is a wasteful number, since it uses less digits than its factorization.

21628626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604776.

The product of its digits is 13824, while the sum is 33.

The square root of 21628626 is about 4650.6586630283. The cubic root of 21628626 is about 278.6183035987.

The spelling of 21628626 in words is "twenty-one million, six hundred twenty-eight thousand, six hundred twenty-six".