33131223121 has 4 divisors (see below), whose sum is σ = 33132660544. Its totient is φ = 33129785700.

The previous prime is 33131223119. The next prime is 33131223187. The reversal of 33131223121 is 12132213133.

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 a cyclic number.

It is not a de Polignac number, because 33131223121 - 2¹ = 33131223119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33131223092 and 33131223101.

It is not an unprimeable number, because it can be changed into a prime (33131221121) 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, 683565 + ... + 730426.

It is an arithmetic number, because the mean of its divisors is an integer number (8283165136).

Almost surely, 2^33131223121 is an apocalyptic number.

It is an amenable number.

33131223121 is a deficient number, since it is larger than the sum of its proper divisors (1437423).

33131223121 is a wasteful number, since it uses less digits than its factorization.

33131223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437422.

The product of its digits is 648, while the sum is 22.

Adding to 33131223121 its reverse (12132213133), we get a palindrome (45263436254).

The spelling of 33131223121 in words is "thirty-three billion, one hundred thirty-one million, two hundred twenty-three thousand, one hundred twenty-one".