33203212121 has 8 divisors (see below), whose sum is σ = 34351558920. Its totient is φ = 32055092608.

The previous prime is 33203212093. The next prime is 33203212157. The reversal of 33203212121 is 12121230233.

It can be written as a sum of positive squares in 4 ways, for example, as 21280974400 + 11922237721 = 145880^2 + 109189^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33203212121 is a prime.

It is a super-2 number, since 2×33203212121² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 33203212093 and 33203212102.

It is not an unprimeable number, because it can be changed into a prime (33203212171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272915 + ... + 375351.

It is an arithmetic number, because the mean of its divisors is an integer number (4293944865).

Almost surely, 2^33203212121 is an apocalyptic number.

It is an amenable number.

33203212121 is a deficient number, since it is larger than the sum of its proper divisors (1148346799).

33203212121 is a wasteful number, since it uses less digits than its factorization.

33203212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113643.

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

Adding to 33203212121 its reverse (12121230233), we get a palindrome (45324442354).

The spelling of 33203212121 in words is "thirty-three billion, two hundred three million, two hundred twelve thousand, one hundred twenty-one".