33111427421 has 4 divisors (see below), whose sum is σ = 33125232000. Its totient is φ = 33097622844.

The previous prime is 33111427399. The next prime is 33111427429. The reversal of 33111427421 is 12472411133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33111427421 is a prime.

It is a super-2 number, since 2×33111427421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33111427429) 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 3 ways as a sum of consecutive naturals, for example, 6898691 + ... + 6903488.

It is an arithmetic number, because the mean of its divisors is an integer number (8281308000).

Almost surely, 2^33111427421 is an apocalyptic number.

It is an amenable number.

33111427421 is a deficient number, since it is larger than the sum of its proper divisors (13804579).

33111427421 is a wasteful number, since it uses less digits than its factorization.

33111427421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13804578.

The product of its digits is 4032, while the sum is 29.

Adding to 33111427421 its reverse (12472411133), we get a palindrome (45583838554).

The spelling of 33111427421 in words is "thirty-three billion, one hundred eleven million, four hundred twenty-seven thousand, four hundred twenty-one".