21544435412054 has 16 divisors (see below), whose sum is σ = 34017622457280. Its totient is φ = 10205231021640.

The previous prime is 21544435412039. The next prime is 21544435412083. The reversal of 21544435412054 is 45021453444512.

It is a junction number, because it is equal to n+sod(n) for n = 21544435411996 and 21544435412014.

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, 22147649 + ... + 23099939.

It is an arithmetic number, because the mean of its divisors is an integer number (2126101403580).

Almost surely, 2^{21544435412054} is an apocalyptic number.

21544435412054 is a deficient number, since it is larger than the sum of its proper divisors (12473187045226).

21544435412054 is a wasteful number, since it uses less digits than its factorization.

21544435412054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547675.

The product of its (nonzero) digits is 1536000, while the sum is 44.

Adding to 21544435412054 its reverse (45021453444512), we get a palindrome (66565888856566).

The spelling of 21544435412054 in words is "twenty-one trillion, five hundred forty-four billion, four hundred thirty-five million, four hundred twelve thousand, fifty-four".