21232221033 has 4 divisors (see below), whose sum is σ = 28309628048. Its totient is φ = 14154814020.

The previous prime is 21232220981. The next prime is 21232221041. The reversal of 21232221033 is 33012223212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21232221033 - 2⁶ = 21232220969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21232221083) 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, 3538703503 + ... + 3538703508.

It is an arithmetic number, because the mean of its divisors is an integer number (7077407012).

Almost surely, 2^21232221033 is an apocalyptic number.

It is an amenable number.

21232221033 is a deficient number, since it is larger than the sum of its proper divisors (7077407015).

21232221033 is an equidigital number, since it uses as much as digits as its factorization.

21232221033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7077407014.

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

Adding to 21232221033 its reverse (33012223212), we get a palindrome (54244444245).

The spelling of 21232221033 in words is "twenty-one billion, two hundred thirty-two million, two hundred twenty-one thousand, thirty-three".