21312223233 has 32 divisors (see below), whose sum is σ = 32853273600. Its totient is φ = 12037622976.

The previous prime is 21312223217. The next prime is 21312223277. The reversal of 21312223233 is 33232221312.

It is not a de Polignac number, because 21312223233 - 2⁴ = 21312223217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21312223033) 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, 652510 + ... + 684392.

It is an arithmetic number, because the mean of its divisors is an integer number (1026664800).

Almost surely, 2^21312223233 is an apocalyptic number.

It is an amenable number.

21312223233 is a deficient number, since it is larger than the sum of its proper divisors (11541050367).

21312223233 is a wasteful number, since it uses less digits than its factorization.

21312223233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32261.

The product of its digits is 2592, while the sum is 24.

Adding to 21312223233 its reverse (33232221312), we get a palindrome (54544444545).

The spelling of 21312223233 in words is "twenty-one billion, three hundred twelve million, two hundred twenty-three thousand, two hundred thirty-three".