21004235021144 has 32 divisors (see below), whose sum is σ = 40888348698240. Its totient is φ = 10104591878400.

The previous prime is 21004235021123. The next prime is 21004235021153. The reversal of 21004235021144 is 44112053240012.

It is a happy number.

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, 244738877 + ... + 244824684.

It is an arithmetic number, because the mean of its divisors is an integer number (1277760896820).

Almost surely, 2^{21004235021144} is an apocalyptic number.

It is an amenable number.

21004235021144 is a deficient number, since it is larger than the sum of its proper divisors (19884113677096).

21004235021144 is a wasteful number, since it uses less digits than its factorization.

21004235021144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489563771 (or 489563767 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 21004235021144 its reverse (44112053240012), we get a palindrome (65116288261156).

The spelling of 21004235021144 in words is "twenty-one trillion, four billion, two hundred thirty-five million, twenty-one thousand, one hundred forty-four".