21146628 has 24 divisors (see below), whose sum is σ = 49533120. Its totient is φ = 7021600.

The previous prime is 21146617. The next prime is 21146633. The reversal of 21146628 is 82664112.

It is a junction number, because it is equal to n+sod(n) for n = 21146595 and 21146604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (2063880).

Almost surely, 2^21146628 is an apocalyptic number.

It is an amenable number.

21146628 is an abundant number, since it is smaller than the sum of its proper divisors (28386492).

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

21146628 is a wasteful number, since it uses less digits than its factorization.

21146628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6827 (or 6825 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 21146628 is about 4598.5462920362. The cubic root of 21146628 is about 276.5330488157.

The spelling of 21146628 in words is "twenty-one million, one hundred forty-six thousand, six hundred twenty-eight".