21224146644403 has 4 divisors (see below), whose sum is σ = 21245563544128. Its totient is φ = 21202729744680.

The previous prime is 21224146644391. The next prime is 21224146644431. The reversal of 21224146644403 is 30444664142212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21224146644403 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 21224146644403.

It is not an unprimeable number, because it can be changed into a prime (21224146644203) 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, 10708448376 + ... + 10708450357.

It is an arithmetic number, because the mean of its divisors is an integer number (5311390886032).

Almost surely, 2^{21224146644403} is an apocalyptic number.

21224146644403 is a deficient number, since it is larger than the sum of its proper divisors (21416899725).

21224146644403 is an equidigital number, since it uses as much as digits as its factorization.

21224146644403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21416899724.

The product of its (nonzero) digits is 884736, while the sum is 43.

The spelling of 21224146644403 in words is "twenty-one trillion, two hundred twenty-four billion, one hundred forty-six million, six hundred forty-four thousand, four hundred three".