21096428 has 12 divisors (see below), whose sum is σ = 38524080. Its totient is φ = 10089552.

The previous prime is 21096421. The next prime is 21096431. The reversal of 21096428 is 82469012.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21096394 and 21096403.

It is not an unprimeable number, because it can be changed into a prime (21096421) 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, 114563 + ... + 114746.

It is an arithmetic number, because the mean of its divisors is an integer number (3210340).

Almost surely, 2^21096428 is an apocalyptic number.

It is an amenable number.

21096428 is a deficient number, since it is larger than the sum of its proper divisors (17427652).

21096428 is a wasteful number, since it uses less digits than its factorization.

21096428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229336 (or 229334 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 21096428 is about 4593.0848021782. The cubic root of 21096428 is about 276.3140547463.

The spelling of 21096428 in words is "twenty-one million, ninety-six thousand, four hundred twenty-eight".