33221222231 has 4 divisors (see below), whose sum is σ = 35175411792. Its totient is φ = 31267032672.

The previous prime is 33221222213. The next prime is 33221222257. The reversal of 33221222231 is 13222212233.

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

It is a de Polignac number, because none of the positive numbers 2^k-33221222231 is a prime.

It is a super-2 number, since 2×33221222231² (a number of 22 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 = 33221222197 and 33221222206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33221222431) 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, 977094755 + ... + 977094788.

It is an arithmetic number, because the mean of its divisors is an integer number (8793852948).

Almost surely, 2^33221222231 is an apocalyptic number.

33221222231 is a deficient number, since it is larger than the sum of its proper divisors (1954189561).

33221222231 is a wasteful number, since it uses less digits than its factorization.

33221222231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954189560.

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

Adding to 33221222231 its reverse (13222212233), we get a palindrome (46443434464).

The spelling of 33221222231 in words is "thirty-three billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred thirty-one".