33821621797 has 4 divisors (see below), whose sum is σ = 33822277516. Its totient is φ = 33820966080.

The previous prime is 33821621753. The next prime is 33821621807. The reversal of 33821621797 is 79712612833.

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 13875426436 + 19946195361 = 117794^2 + 141231^2 .

It is a cyclic number.

It is not a de Polignac number, because 33821621797 - 2¹¹ = 33821619749 is a prime.

It is a super-2 number, since 2×33821621797² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33821621797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33821321797) 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, 243204 + ... + 356077.

It is an arithmetic number, because the mean of its divisors is an integer number (8455569379).

Almost surely, 2^33821621797 is an apocalyptic number.

It is an amenable number.

33821621797 is a deficient number, since it is larger than the sum of its proper divisors (655719).

33821621797 is an equidigital number, since it uses as much as digits as its factorization.

33821621797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655718.

The product of its digits is 762048, while the sum is 49.

The spelling of 33821621797 in words is "thirty-three billion, eight hundred twenty-one million, six hundred twenty-one thousand, seven hundred ninety-seven".