21001220310233 has 32 divisors (see below), whose sum is σ = 21763629888000. Its totient is φ = 20253025900800.

The previous prime is 21001220310229. The next prime is 21001220310241. The reversal of 21001220310233 is 33201302210012.

It is a cyclic number.

It is not a de Polignac number, because 21001220310233 - 2² = 21001220310229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21001220315233) 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, 4544732663 + ... + 4544737283.

It is an arithmetic number, because the mean of its divisors is an integer number (680113434000).

Almost surely, 2^{21001220310233} is an apocalyptic number.

It is an amenable number.

21001220310233 is a deficient number, since it is larger than the sum of its proper divisors (762409577767).

21001220310233 is a wasteful number, since it uses less digits than its factorization.

21001220310233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8913.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21001220310233 its reverse (33201302210012), we get a palindrome (54202522520245).

The spelling of 21001220310233 in words is "twenty-one trillion, one billion, two hundred twenty million, three hundred ten thousand, two hundred thirty-three".