21544334543254 has 8 divisors (see below), whose sum is σ = 34217472509928. Its totient is φ = 10138510373280.

The previous prime is 21544334543197. The next prime is 21544334543261. The reversal of 21544334543254 is 45234543344512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21544334543198 and 21544334543207.

It is a congruent number.

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, 316828449132 + ... + 316828449199.

It is an arithmetic number, because the mean of its divisors is an integer number (4277184063741).

Almost surely, 2^{21544334543254} is an apocalyptic number.

21544334543254 is a deficient number, since it is larger than the sum of its proper divisors (12673137966674).

21544334543254 is a wasteful number, since it uses less digits than its factorization.

21544334543254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633656898350.

The product of its digits is 13824000, while the sum is 49.

Adding to 21544334543254 its reverse (45234543344512), we get a palindrome (66778877887766).

The spelling of 21544334543254 in words is "twenty-one trillion, five hundred forty-four billion, three hundred thirty-four million, five hundred forty-three thousand, two hundred fifty-four".