21110554461 has 8 divisors (see below), whose sum is σ = 28801996960. Its totient is φ = 13746407472.

The previous prime is 21110554459. The next prime is 21110554471. The reversal of 21110554461 is 16445501112.

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

It is not a de Polignac number, because 21110554461 - 2¹ = 21110554459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110554471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81823726 + ... + 81823983.

It is an arithmetic number, because the mean of its divisors is an integer number (3600249620).

Almost surely, 2^21110554461 is an apocalyptic number.

It is an amenable number.

21110554461 is a deficient number, since it is larger than the sum of its proper divisors (7691442499).

21110554461 is a wasteful number, since it uses less digits than its factorization.

21110554461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163647755.

The product of its (nonzero) digits is 4800, while the sum is 30.

The spelling of 21110554461 in words is "twenty-one billion, one hundred ten million, five hundred fifty-four thousand, four hundred sixty-one".