21233203313 has 16 divisors (see below), whose sum is σ = 24436026240. Its totient is φ = 18072948096.

The previous prime is 21233203309. The next prime is 21233203331. The reversal of 21233203313 is 31330233212.

It is not a de Polignac number, because 21233203313 - 2² = 21233203309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21233203373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1463531 + ... + 1477967.

It is an arithmetic number, because the mean of its divisors is an integer number (1527251640).

Almost surely, 2^21233203313 is an apocalyptic number.

It is an amenable number.

21233203313 is a deficient number, since it is larger than the sum of its proper divisors (3202822927).

21233203313 is a wasteful number, since it uses less digits than its factorization.

21233203313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15896.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21233203313 its reverse (31330233212), we get a palindrome (52563436525).

The spelling of 21233203313 in words is "twenty-one billion, two hundred thirty-three million, two hundred three thousand, three hundred thirteen".