21377203 has 4 divisors (see below), whose sum is σ = 21429880. Its totient is φ = 21324528.

The previous prime is 21377201. The next prime is 21377233. The reversal of 21377203 is 30277312.

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

It is a cyclic number.

It is not a de Polignac number, because 21377203 - 2¹ = 21377201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21377201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25725 + ... + 26542.

It is an arithmetic number, because the mean of its divisors is an integer number (5357470).

Almost surely, 2^21377203 is an apocalyptic number.

21377203 is a deficient number, since it is larger than the sum of its proper divisors (52677).

21377203 is an equidigital number, since it uses as much as digits as its factorization.

21377203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52676.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 21377203 is about 4623.5487452821. The cubic root of 21377203 is about 277.5344891257.

The spelling of 21377203 in words is "twenty-one million, three hundred seventy-seven thousand, two hundred three".