21204040433 has 8 divisors (see below), whose sum is σ = 21353400000. Its totient is φ = 21055109328.

The previous prime is 21204040421. The next prime is 21204040439. The reversal of 21204040433 is 33404040212.

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 21204040433 - 2³⁰ = 20130298609 is a prime.

It is a super-2 number, since 2×21204040433² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21204040399 and 21204040408.

It is not an unprimeable number, because it can be changed into a prime (21204040439) 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, 7466 + ... + 206067.

It is an arithmetic number, because the mean of its divisors is an integer number (2669175000).

Almost surely, 2^21204040433 is an apocalyptic number.

It is an amenable number.

21204040433 is a deficient number, since it is larger than the sum of its proper divisors (149359567).

21204040433 is a wasteful number, since it uses less digits than its factorization.

21204040433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214231.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21204040433 its reverse (33404040212), we get a palindrome (54608080645).

The spelling of 21204040433 in words is "twenty-one billion, two hundred four million, forty thousand, four hundred thirty-three".