21201223233 has 16 divisors (see below), whose sum is σ = 28487865600. Its totient is φ = 14024787840.

The previous prime is 21201223231. The next prime is 21201223247. The reversal of 21201223233 is 33232210212.

It is a happy number.

It is not a de Polignac number, because 21201223233 - 2¹ = 21201223231 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201223231) 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, 148863 + ... + 254091.

It is an arithmetic number, because the mean of its divisors is an integer number (1780491600).

Almost surely, 2^21201223233 is an apocalyptic number.

It is an amenable number.

21201223233 is a deficient number, since it is larger than the sum of its proper divisors (7286642367).

21201223233 is a wasteful number, since it uses less digits than its factorization.

21201223233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105752.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21201223233 its reverse (33232210212), we get a palindrome (54433433445).

The spelling of 21201223233 in words is "twenty-one billion, two hundred one million, two hundred twenty-three thousand, two hundred thirty-three".