33213123021 has 16 divisors (see below), whose sum is σ = 49764145536. Its totient is φ = 19550198976.

The previous prime is 33213123019. The next prime is 33213123079. The reversal of 33213123021 is 12032131233.

It is not a de Polignac number, because 33213123021 - 2¹ = 33213123019 is a prime.

It is a super-3 number, since 3×33213123021³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33213023021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18512550 + ... + 18514343.

It is an arithmetic number, because the mean of its divisors is an integer number (3110259096).

Almost surely, 2^33213123021 is an apocalyptic number.

It is an amenable number.

33213123021 is a deficient number, since it is larger than the sum of its proper divisors (16551022515).

33213123021 is a wasteful number, since it uses less digits than its factorization.

33213123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37026932.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 33213123021 its reverse (12032131233), we get a palindrome (45245254254).

The spelling of 33213123021 in words is "thirty-three billion, two hundred thirteen million, one hundred twenty-three thousand, twenty-one".