21627406 has 8 divisors (see below), whose sum is σ = 33851664. Its totient is φ = 10343520.

The previous prime is 21627401. The next prime is 21627407. The reversal of 21627406 is 60472612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21627401) 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, 235035 + ... + 235126.

It is an arithmetic number, because the mean of its divisors is an integer number (4231458).

Almost surely, 2^21627406 is an apocalyptic number.

21627406 is a deficient number, since it is larger than the sum of its proper divisors (12224258).

21627406 is a wasteful number, since it uses less digits than its factorization.

21627406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470186.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 21627406 is about 4650.5274969620. The cubic root of 21627406 is about 278.6130648514.

The spelling of 21627406 in words is "twenty-one million, six hundred twenty-seven thousand, four hundred six".