21550331405244 has 24 divisors (see below), whose sum is σ = 50341182807888. Its totient is φ = 7175290059520.

The previous prime is 21550331405237. The next prime is 21550331405257. The reversal of 21550331405244 is 44250413305512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1019206767 + ... + 1019227910.

It is an arithmetic number, because the mean of its divisors is an integer number (2097549283662).

Almost surely, 2^{21550331405244} is an apocalyptic number.

It is an amenable number.

21550331405244 is an abundant number, since it is smaller than the sum of its proper divisors (28790851402644).

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

21550331405244 is a wasteful number, since it uses less digits than its factorization.

21550331405244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038435565 (or 2038435563 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

The spelling of 21550331405244 in words is "twenty-one trillion, five hundred fifty billion, three hundred thirty-one million, four hundred five thousand, two hundred forty-four".