21628676 has 12 divisors (see below), whose sum is σ = 37992780. Its totient is φ = 10773600.

The previous prime is 21628667. The next prime is 21628681. The reversal of 21628676 is 67682612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3904576 + 17724100 = 1976^2 + 4210^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8975 + ... + 11126.

It is an arithmetic number, because the mean of its divisors is an integer number (3166065).

Almost surely, 2^21628676 is an apocalyptic number.

It is an amenable number.

21628676 is a deficient number, since it is larger than the sum of its proper divisors (16364104).

21628676 is a wasteful number, since it uses less digits than its factorization.

21628676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20374 (or 20372 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 21628676 is about 4650.6640386078. The cubic root of 21628676 is about 278.6185182973.

It can be divided in two parts, 21628 and 676, that multiplied together give a triangular number (14620528 = T₅₄₀₇).

The spelling of 21628676 in words is "twenty-one million, six hundred twenty-eight thousand, six hundred seventy-six".