21335044631244 has 12 divisors (see below), whose sum is σ = 49781770806264. Its totient is φ = 7111681543744.

The previous prime is 21335044631231. The next prime is 21335044631339. The reversal of 21335044631244 is 44213644053312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21335044631196 and 21335044631205.

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, 888960192957 + ... + 888960192980.

It is an arithmetic number, because the mean of its divisors is an integer number (4148480900522).

Almost surely, 2^{21335044631244} is an apocalyptic number.

It is an amenable number.

21335044631244 is an abundant number, since it is smaller than the sum of its proper divisors (28446726175020).

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

21335044631244 is a wasteful number, since it uses less digits than its factorization.

21335044631244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777920385944 (or 1777920385942 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 42.

Adding to 21335044631244 its reverse (44213644053312), we get a palindrome (65548688684556).

The spelling of 21335044631244 in words is "twenty-one trillion, three hundred thirty-five billion, forty-four million, six hundred thirty-one thousand, two hundred forty-four".