21224540433 has 8 divisors (see below), whose sum is σ = 28300218496. Its totient is φ = 14149278000.

The previous prime is 21224540423. The next prime is 21224540471. The reversal of 21224540433 is 33404542212.

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

It is not a de Polignac number, because 21224540433 - 2⁵ = 21224540401 is a prime.

It is a super-2 number, since 2×21224540433² (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 21224540433.

It is not an unprimeable number, because it can be changed into a prime (21224540423) 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, 46248 + ... + 211158.

It is an arithmetic number, because the mean of its divisors is an integer number (3537527312).

Almost surely, 2^21224540433 is an apocalyptic number.

It is an amenable number.

21224540433 is a deficient number, since it is larger than the sum of its proper divisors (7075678063).

21224540433 is a wasteful number, since it uses less digits than its factorization.

21224540433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207815.

The product of its (nonzero) digits is 23040, while the sum is 30.

The spelling of 21224540433 in words is "twenty-one billion, two hundred twenty-four million, five hundred forty thousand, four hundred thirty-three".