33312120221 has 4 divisors (see below), whose sum is σ = 33317559744. Its totient is φ = 33306680700.

The previous prime is 33312120169. The next prime is 33312120227. The reversal of 33312120221 is 12202121333.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12202121333 = 3671 ⋅3323923.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33312120221 is a prime.

It is a super-2 number, since 2×33312120221² (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 = 33312120193 and 33312120202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33312120227) 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, 2710565 + ... + 2722826.

It is an arithmetic number, because the mean of its divisors is an integer number (8329389936).

Almost surely, 2^33312120221 is an apocalyptic number.

It is an amenable number.

33312120221 is a deficient number, since it is larger than the sum of its proper divisors (5439523).

33312120221 is an equidigital number, since it uses as much as digits as its factorization.

33312120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439522.

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

Adding to 33312120221 its reverse (12202121333), we get a palindrome (45514241554).

The spelling of 33312120221 in words is "thirty-three billion, three hundred twelve million, one hundred twenty thousand, two hundred twenty-one".