21203133303 has 32 divisors (see below), whose sum is σ = 32241940992. Its totient is φ = 12268713600.

The previous prime is 21203133299. The next prime is 21203133311. The reversal of 21203133303 is 30333130212.

It is not a de Polignac number, because 21203133303 - 2² = 21203133299 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21203133303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203133103) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 384801 + ... + 436437.

It is an arithmetic number, because the mean of its divisors is an integer number (1007560656).

Almost surely, 2^21203133303 is an apocalyptic number.

21203133303 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21203133303 is a deficient number, since it is larger than the sum of its proper divisors (11038807689).

21203133303 is a wasteful number, since it uses less digits than its factorization.

21203133303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52215.

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 21203133303 its reverse (30333130212), we get a palindrome (51536263515).

The spelling of 21203133303 in words is "twenty-one billion, two hundred three million, one hundred thirty-three thousand, three hundred three".