33131022221 has 24 divisors (see below), whose sum is σ = 39027230592. Its totient is φ = 28030860000.

The previous prime is 33131022167. The next prime is 33131022229. The reversal of 33131022221 is 12222013133.

It is not a de Polignac number, because 33131022221 - 2⁶ = 33131022157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 33131022193 and 33131022202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33131022229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57905 + ... + 263846.

It is an arithmetic number, because the mean of its divisors is an integer number (1626134608).

Almost surely, 2^33131022221 is an apocalyptic number.

It is an amenable number.

33131022221 is a deficient number, since it is larger than the sum of its proper divisors (5896208371).

33131022221 is a wasteful number, since it uses less digits than its factorization.

33131022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321833 (or 321822 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 33131022221 its reverse (12222013133), we get a palindrome (45353035354).

The spelling of 33131022221 in words is "thirty-three billion, one hundred thirty-one million, twenty-two thousand, two hundred twenty-one".