33424642021 has 4 divisors (see below), whose sum is σ = 35390797452. Its totient is φ = 31458486592.

The previous prime is 33424642007. The next prime is 33424642033. The reversal of 33424642021 is 12024642433.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12024642433 = 467 ⋅25748699.

It can be written as a sum of positive squares in 2 ways, for example, as 15532636900 + 17892005121 = 124630^2 + 133761^2 .

It is a cyclic number.

It is not a de Polignac number, because 33424642021 - 2¹¹ = 33424639973 is a prime.

It is a super-2 number, since 2×33424642021² (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 (33424642081) 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, 983077690 + ... + 983077723.

It is an arithmetic number, because the mean of its divisors is an integer number (8847699363).

Almost surely, 2^33424642021 is an apocalyptic number.

It is an amenable number.

33424642021 is a deficient number, since it is larger than the sum of its proper divisors (1966155431).

33424642021 is a wasteful number, since it uses less digits than its factorization.

33424642021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966155430.

The product of its (nonzero) digits is 27648, while the sum is 31.

The spelling of 33424642021 in words is "thirty-three billion, four hundred twenty-four million, six hundred forty-two thousand, twenty-one".