33611664021 has 16 divisors (see below), whose sum is σ = 48318875136. Its totient is φ = 20660112576.

The previous prime is 33611664001. The next prime is 33611664041. The reversal of 33611664021 is 12046611633.

It is an interprime number because it is at equal distance from previous prime (33611664001) and next prime (33611664041).

It is not a de Polignac number, because 33611664021 - 2⁶ = 33611663957 is a prime.

It is a super-2 number, since 2×33611664021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33611664001) 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 15 ways as a sum of consecutive naturals, for example, 465670 + ... + 532983.

It is an arithmetic number, because the mean of its divisors is an integer number (3019929696).

Almost surely, 2^33611664021 is an apocalyptic number.

It is an amenable number.

33611664021 is a deficient number, since it is larger than the sum of its proper divisors (14707211115).

33611664021 is a wasteful number, since it uses less digits than its factorization.

33611664021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999532.

The product of its (nonzero) digits is 15552, while the sum is 33.

The spelling of 33611664021 in words is "thirty-three billion, six hundred eleven million, six hundred sixty-four thousand, twenty-one".