21203231133 has 32 divisors (see below), whose sum is σ = 33289353472. Its totient is φ = 11754201600.

The previous prime is 21203231087. The next prime is 21203231167. The reversal of 21203231133 is 33113230212.

It is not a de Polignac number, because 21203231133 - 2¹² = 21203227037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203231183) 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, 19858 + ... + 206883.

It is an arithmetic number, because the mean of its divisors is an integer number (1040292296).

Almost surely, 2^21203231133 is an apocalyptic number.

It is an amenable number.

21203231133 is a deficient number, since it is larger than the sum of its proper divisors (12086122339).

21203231133 is a wasteful number, since it uses less digits than its factorization.

21203231133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226885.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21203231133 its reverse (33113230212), we get a palindrome (54316461345).

The spelling of 21203231133 in words is "twenty-one billion, two hundred three million, two hundred thirty-one thousand, one hundred thirty-three".