21221232233 has 8 divisors (see below), whose sum is σ = 22506910656. Its totient is φ = 19965805200.

The previous prime is 21221232223. The next prime is 21221232239. The reversal of 21221232233 is 33223212212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221232233 - 2⁴ = 21221232217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221232199 and 21221232208.

It is not an unprimeable number, because it can be changed into a prime (21221232239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7561403 + ... + 7564208.

It is an arithmetic number, because the mean of its divisors is an integer number (2813363832).

Almost surely, 2^21221232233 is an apocalyptic number.

21221232233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21221232233 is a deficient number, since it is larger than the sum of its proper divisors (1285678423).

21221232233 is a wasteful number, since it uses less digits than its factorization.

21221232233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15125695.

The product of its digits is 1728, while the sum is 23.

Adding to 21221232233 its reverse (33223212212), we get a palindrome (54444444445).

The spelling of 21221232233 in words is "twenty-one billion, two hundred twenty-one million, two hundred thirty-two thousand, two hundred thirty-three".