21120803 has 8 divisors (see below), whose sum is σ = 23126256. Its totient is φ = 19129600.

The previous prime is 21120793. The next prime is 21120809. The reversal of 21120803 is 30802112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21120803 - 2¹² = 21116707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120809) 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, 326 + ... + 6507.

It is an arithmetic number, because the mean of its divisors is an integer number (2890782).

Almost surely, 2^21120803 is an apocalyptic number.

21120803 is a deficient number, since it is larger than the sum of its proper divisors (2005453).

21120803 is a wasteful number, since it uses less digits than its factorization.

21120803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7125.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 21120803 is about 4595.7374816236. The cubic root of 21120803 is about 276.4204323567.

Adding to 21120803 its reverse (30802112), we get a palindrome (51922915).

The spelling of 21120803 in words is "twenty-one million, one hundred twenty thousand, eight hundred three".