21379803 has 4 divisors (see below), whose sum is σ = 28506408. Its totient is φ = 14253200.

The previous prime is 21379763. The next prime is 21379817. The reversal of 21379803 is 30897312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21379803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21379823) 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, 3563298 + ... + 3563303.

It is an arithmetic number, because the mean of its divisors is an integer number (7126602).

Almost surely, 2^21379803 is an apocalyptic number.

21379803 is a deficient number, since it is larger than the sum of its proper divisors (7126605).

21379803 is an equidigital number, since it uses as much as digits as its factorization.

21379803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7126604.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21379803 is about 4623.8299060411. The cubic root of 21379803 is about 277.5457403703.

The spelling of 21379803 in words is "twenty-one million, three hundred seventy-nine thousand, eight hundred three".