21042315044 has 12 divisors (see below), whose sum is σ = 37267715184. Its totient is φ = 10394396424.

The previous prime is 21042315031. The next prime is 21042315061. The reversal of 21042315044 is 44051324012.

It is a super-3 number, since 3×21042315044³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31689902 + ... + 31690565.

It is an arithmetic number, because the mean of its divisors is an integer number (3105642932).

Almost surely, 2^21042315044 is an apocalyptic number.

It is an amenable number.

21042315044 is a deficient number, since it is larger than the sum of its proper divisors (16225400140).

21042315044 is a wasteful number, since it uses less digits than its factorization.

21042315044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63380554 (or 63380552 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21042315044 its reverse (44051324012), we get a palindrome (65093639056).

The spelling of 21042315044 in words is "twenty-one billion, forty-two million, three hundred fifteen thousand, forty-four".