21031331203 has 4 divisors (see below), whose sum is σ = 21191875848. Its totient is φ = 20870786560.

The previous prime is 21031331197. The next prime is 21031331213. The reversal of 21031331203 is 30213313012.

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 21031331203 - 2²⁵ = 20997776771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031331213) 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, 80272126 + ... + 80272387.

It is an arithmetic number, because the mean of its divisors is an integer number (5297968962).

Almost surely, 2^21031331203 is an apocalyptic number.

21031331203 is a deficient number, since it is larger than the sum of its proper divisors (160544645).

21031331203 is a wasteful number, since it uses less digits than its factorization.

21031331203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160544644.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21031331203 its reverse (30213313012), we get a palindrome (51244644215).

The spelling of 21031331203 in words is "twenty-one billion, thirty-one million, three hundred thirty-one thousand, two hundred three".