21450133443 has 4 divisors (see below), whose sum is σ = 28600177928. Its totient is φ = 14300088960.

The previous prime is 21450133433. The next prime is 21450133457. The reversal of 21450133443 is 34433105412.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21450133443 - 2⁴ = 21450133427 is a prime.

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 21450133443.

It is not an unprimeable number, because it can be changed into a prime (21450133403) 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, 3575022238 + ... + 3575022243.

It is an arithmetic number, because the mean of its divisors is an integer number (7150044482).

Almost surely, 2^21450133443 is an apocalyptic number.

21450133443 is a deficient number, since it is larger than the sum of its proper divisors (7150044485).

21450133443 is an equidigital number, since it uses as much as digits as its factorization.

21450133443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7150044484.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 21450133443 its reverse (34433105412), we get a palindrome (55883238855).

The spelling of 21450133443 in words is "twenty-one billion, four hundred fifty million, one hundred thirty-three thousand, four hundred forty-three".