21210531203 has 4 divisors (see below), whose sum is σ = 21303153840. Its totient is φ = 21117908568.

The previous prime is 21210531157. The next prime is 21210531263. The reversal of 21210531203 is 30213501212.

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 21210531203 - 2²⁰ = 21209482627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210531263) 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, 46310975 + ... + 46311432.

It is an arithmetic number, because the mean of its divisors is an integer number (5325788460).

Almost surely, 2^21210531203 is an apocalyptic number.

21210531203 is a deficient number, since it is larger than the sum of its proper divisors (92622637).

21210531203 is an equidigital number, since it uses as much as digits as its factorization.

21210531203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92622636.

The product of its (nonzero) digits is 360, while the sum is 20.

The spelling of 21210531203 in words is "twenty-one billion, two hundred ten million, five hundred thirty-one thousand, two hundred three".