33518788421 has 24 divisors (see below), whose sum is σ = 36947389920. Its totient is φ = 30321552096.

The previous prime is 33518788399. The next prime is 33518788427. The reversal of 33518788421 is 12488781533.

It is not a de Polignac number, because 33518788421 - 2¹⁴ = 33518772037 is a prime.

It is a super-2 number, since 2×33518788421² (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 33518788421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33518788427) 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 23 ways as a sum of consecutive naturals, for example, 6560750 + ... + 6565856.

It is an arithmetic number, because the mean of its divisors is an integer number (1539474580).

Almost surely, 2^33518788421 is an apocalyptic number.

It is an amenable number.

33518788421 is a deficient number, since it is larger than the sum of its proper divisors (3428601499).

33518788421 is a wasteful number, since it uses less digits than its factorization.

33518788421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5825 (or 5802 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 50.

The spelling of 33518788421 in words is "thirty-three billion, five hundred eighteen million, seven hundred eighty-eight thousand, four hundred twenty-one".