21301828 has 12 divisors (see below), whose sum is σ = 37340352. Its totient is φ = 10633160.

The previous prime is 21301823. The next prime is 21301843. The reversal of 21301828 is 82810312.

It is a super-2 number, since 2×21301828² = 907535752283168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21301823) 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, 1528 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (3111696).

Almost surely, 2^21301828 is an apocalyptic number.

It is an amenable number.

21301828 is a deficient number, since it is larger than the sum of its proper divisors (16038524).

21301828 is a wasteful number, since it uses less digits than its factorization.

21301828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8882 (or 8880 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 21301828 is about 4615.3903410221. The cubic root of 21301828 is about 277.2079138631.

The spelling of 21301828 in words is "twenty-one million, three hundred one thousand, eight hundred twenty-eight".