21455489433 has 8 divisors (see below), whose sum is σ = 32694079168. Its totient is φ = 12260279664.

The previous prime is 21455489431. The next prime is 21455489479. The reversal of 21455489433 is 33498455412.

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

It is not a de Polignac number, because 21455489433 - 2¹ = 21455489431 is a prime.

It is a super-3 number, since 3×21455489433³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21455489431) 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, 510844966 + ... + 510845007.

It is an arithmetic number, because the mean of its divisors is an integer number (4086759896).

Almost surely, 2^21455489433 is an apocalyptic number.

It is an amenable number.

21455489433 is a deficient number, since it is larger than the sum of its proper divisors (11238589735).

21455489433 is a wasteful number, since it uses less digits than its factorization.

21455489433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021689983.

The product of its digits is 2073600, while the sum is 48.

The spelling of 21455489433 in words is "twenty-one billion, four hundred fifty-five million, four hundred eighty-nine thousand, four hundred thirty-three".