21443590842 has 8 divisors (see below), whose sum is σ = 42887181696. Its totient is φ = 7147863612.

The previous prime is 21443590783. The next prime is 21443590853. The reversal of 21443590842 is 24809534412.

It is a happy number.

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

21443590842 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21443590794 and 21443590803.

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, 1786965898 + ... + 1786965909.

It is an arithmetic number, because the mean of its divisors is an integer number (5360897712).

Almost surely, 2^21443590842 is an apocalyptic number.

21443590842 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21443590842 is a wasteful number, since it uses less digits than its factorization.

21443590842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3573931812.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 21443590842 in words is "twenty-one billion, four hundred forty-three million, five hundred ninety thousand, eight hundred forty-two".