21628654 has 8 divisors (see below), whose sum is σ = 32491368. Its totient is φ = 10798200.

The previous prime is 21628643. The next prime is 21628657. The reversal of 21628654 is 45682612.

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 (21628657) 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, 6312 + ... + 9115.

It is an arithmetic number, because the mean of its divisors is an integer number (4061421).

Almost surely, 2^21628654 is an apocalyptic number.

21628654 is a deficient number, since it is larger than the sum of its proper divisors (10862714).

21628654 is a wasteful number, since it uses less digits than its factorization.

21628654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16130.

The product of its digits is 23040, while the sum is 34.

The square root of 21628654 is about 4650.6616733536. The cubic root of 21628654 is about 278.6184238300.

It can be divided in two parts, 2162 and 8654, that added together give a square (10816 = 104²).

The spelling of 21628654 in words is "twenty-one million, six hundred twenty-eight thousand, six hundred fifty-four".