21444502435 has 4 divisors (see below), whose sum is σ = 25733402928. Its totient is φ = 17155601944.

The previous prime is 21444502421. The next prime is 21444502447. The reversal of 21444502435 is 53420544412.

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

It is a cyclic number.

It is not a de Polignac number, because 21444502435 - 2⁷ = 21444502307 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 21444502435.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144450239 + ... + 2144450248.

It is an arithmetic number, because the mean of its divisors is an integer number (6433350732).

Almost surely, 2^21444502435 is an apocalyptic number.

21444502435 is a deficient number, since it is larger than the sum of its proper divisors (4288900493).

21444502435 is an equidigital number, since it uses as much as digits as its factorization.

21444502435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288900492.

The product of its (nonzero) digits is 76800, while the sum is 34.

The spelling of 21444502435 in words is "twenty-one billion, four hundred forty-four million, five hundred two thousand, four hundred thirty-five".