33231231021221 has 4 divisors (see below), whose sum is σ = 33231463010892. Its totient is φ = 33230999031552.

The previous prime is 33231231021199. The next prime is 33231231021229. The reversal of 33231231021221 is 12212013213233.

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

It can be written as a sum of positive squares in 2 ways, for example, as 216025096225 + 33015205924996 = 464785^2 + 5745886^2 .

It is a cyclic number.

It is not a de Polignac number, because 33231231021221 - 2²⁶ = 33231163912357 is a prime.

It is a super-2 number, since 2×33231231021221² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33231231021229) 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, 115779836 + ... + 116066501.

It is an arithmetic number, because the mean of its divisors is an integer number (8307865752723).

Almost surely, 2^{33231231021221} is an apocalyptic number.

It is an amenable number.

33231231021221 is a deficient number, since it is larger than the sum of its proper divisors (231989671).

33231231021221 is a wasteful number, since it uses less digits than its factorization.

33231231021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231989670.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 33231231021221 its reverse (12212013213233), we get a palindrome (45443244234454).

The spelling of 33231231021221 in words is "thirty-three trillion, two hundred thirty-one billion, two hundred thirty-one million, twenty-one thousand, two hundred twenty-one".