33404311021 has 4 divisors (see below), whose sum is σ = 33710772700. Its totient is φ = 33097849344.

The previous prime is 33404311009. The next prime is 33404311063. The reversal of 33404311021 is 12011340433.

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 19530062500 + 13874248521 = 139750^2 + 117789^2 .

It is a cyclic number.

It is not a de Polignac number, because 33404311021 - 2³¹ = 31256827373 is a prime.

It is a super-2 number, since 2×33404311021² (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 = 33404310983 and 33404311001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33404317021) 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, 153230676 + ... + 153230893.

It is an arithmetic number, because the mean of its divisors is an integer number (8427693175).

Almost surely, 2^33404311021 is an apocalyptic number.

It is an amenable number.

33404311021 is a deficient number, since it is larger than the sum of its proper divisors (306461679).

33404311021 is a wasteful number, since it uses less digits than its factorization.

33404311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306461678.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 33404311021 its reverse (12011340433), we get a palindrome (45415651454).

The spelling of 33404311021 in words is "thirty-three billion, four hundred four million, three hundred eleven thousand, twenty-one".