21329933546 has 8 divisors (see below), whose sum is σ = 32028476004. Its totient is φ = 10653774880.

The previous prime is 21329933491. The next prime is 21329933549. The reversal of 21329933546 is 64533992312.

It can be written as a sum of positive squares in 2 ways, for example, as 21327389521 + 2544025 = 146039^2 + 1595^2 .

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

It is a super-2 number, since 2×21329933546² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21329933546.

It is not an unprimeable number, because it can be changed into a prime (21329933549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5593565 + ... + 5597376.

Almost surely, 2^21329933546 is an apocalyptic number.

21329933546 is a deficient number, since it is larger than the sum of its proper divisors (10698542458).

21329933546 is a wasteful number, since it uses less digits than its factorization.

21329933546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11191896.

The product of its digits is 1049760, while the sum is 47.

The spelling of 21329933546 in words is "twenty-one billion, three hundred twenty-nine million, nine hundred thirty-three thousand, five hundred forty-six".