21684007033 has 8 divisors (see below), whose sum is σ = 23376170048. Its totient is φ = 19995295824.

The previous prime is 21684007031. The next prime is 21684007043. The reversal of 21684007033 is 33070048612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21684007033 - 2¹ = 21684007031 is a prime.

It is a super-2 number, since 2×21684007033² (a number of 21 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 21684007033.

It is not an unprimeable number, because it can be changed into a prime (21684007031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 849891 + ... + 875032.

It is an arithmetic number, because the mean of its divisors is an integer number (2922021256).

Almost surely, 2^21684007033 is an apocalyptic number.

It is an amenable number.

21684007033 is a deficient number, since it is larger than the sum of its proper divisors (1692163015).

21684007033 is a wasteful number, since it uses less digits than its factorization.

21684007033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725903.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 21684007033 in words is "twenty-one billion, six hundred eighty-four million, seven thousand, thirty-three".