21440533433 has 32 divisors (see below), whose sum is σ = 24930218880. Its totient is φ = 18286625280.

The previous prime is 21440533427. The next prime is 21440533453. The reversal of 21440533433 is 33433504412.

It is not a de Polignac number, because 21440533433 - 2¹⁶ = 21440467897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21440533433.

It is not an unprimeable number, because it can be changed into a prime (21440533423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33344210 + ... + 33344852.

It is an arithmetic number, because the mean of its divisors is an integer number (779069340).

Almost surely, 2^21440533433 is an apocalyptic number.

It is an amenable number.

21440533433 is a deficient number, since it is larger than the sum of its proper divisors (3489685447).

21440533433 is an equidigital number, since it uses as much as digits as its factorization.

21440533433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322 (or 1288 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 32.

The spelling of 21440533433 in words is "twenty-one billion, four hundred forty million, five hundred thirty-three thousand, four hundred thirty-three".