21096388 has 24 divisors (see below), whose sum is σ = 39312000. Its totient is φ = 9871488.

The previous prime is 21096379. The next prime is 21096389. The reversal of 21096388 is 88369012.

It is a super-3 number, since 3×21096388³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21096389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12753 + ... + 14311.

It is an arithmetic number, because the mean of its divisors is an integer number (1638000).

Almost surely, 2^21096388 is an apocalyptic number.

It is an amenable number.

21096388 is a deficient number, since it is larger than the sum of its proper divisors (18215612).

21096388 is a wasteful number, since it uses less digits than its factorization.

21096388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779 (or 1777 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 21096388 is about 4593.0804478041. The cubic root of 21096388 is about 276.3138801106.

The spelling of 21096388 in words is "twenty-one million, ninety-six thousand, three hundred eighty-eight".