21210011203 has 4 divisors (see below), whose sum is σ = 21301041528. Its totient is φ = 21118980880.

The previous prime is 21210011153. The next prime is 21210011279. The reversal of 21210011203 is 30211001212.

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 21210011203 - 2¹³ = 21210003011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210012203) 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, 45514813 + ... + 45515278.

It is an arithmetic number, because the mean of its divisors is an integer number (5325260382).

Almost surely, 2^21210011203 is an apocalyptic number.

21210011203 is a deficient number, since it is larger than the sum of its proper divisors (91030325).

21210011203 is an equidigital number, since it uses as much as digits as its factorization.

21210011203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91030324.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21210011203 its reverse (30211001212), we get a palindrome (51421012415).

Subtracting 21210011203 from its reverse (30211001212), we obtain a palindrome (9000990009).

The spelling of 21210011203 in words is "twenty-one billion, two hundred ten million, eleven thousand, two hundred three".