21232233331 has 4 divisors (see below), whose sum is σ = 21232766664. Its totient is φ = 21231700000.

The previous prime is 21232233289. The next prime is 21232233371. The reversal of 21232233331 is 13333223212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21232233331 - 2¹³ = 21232225139 is a prime.

It is a super-2 number, since 2×21232233331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21232233296 and 21232233305.

It is not an unprimeable number, because it can be changed into a prime (21232233371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201670 + ... + 288331.

It is an arithmetic number, because the mean of its divisors is an integer number (5308191666).

Almost surely, 2^21232233331 is an apocalyptic number.

21232233331 is a deficient number, since it is larger than the sum of its proper divisors (533333).

21232233331 is an equidigital number, since it uses as much as digits as its factorization.

21232233331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533332.

The product of its digits is 3888, while the sum is 25.

Adding to 21232233331 its reverse (13333223212), we get a palindrome (34565456543).

The spelling of 21232233331 in words is "twenty-one billion, two hundred thirty-two million, two hundred thirty-three thousand, three hundred thirty-one".