21061828 has 12 divisors (see below), whose sum is σ = 37642752. Its totient is φ = 10306760.

The previous prime is 21061819. The next prime is 21061871. The reversal of 21061828 is 82816012.

It is a junction number, because it is equal to n+sod(n) for n = 21061796 and 21061805.

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, 55828 + ... + 56203.

It is an arithmetic number, because the mean of its divisors is an integer number (3136896).

Almost surely, 2^21061828 is an apocalyptic number.

It is an amenable number.

21061828 is a deficient number, since it is larger than the sum of its proper divisors (16580924).

21061828 is a wasteful number, since it uses less digits than its factorization.

21061828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112082 (or 112080 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 21061828 is about 4589.3167247424. The cubic root of 21061828 is about 276.1629122918.

The spelling of 21061828 in words is "twenty-one million, sixty-one thousand, eight hundred twenty-eight".