54921656221 has 8 divisors (see below), whose sum is σ = 55206070304. Its totient is φ = 54637927920.

The previous prime is 54921656191. The next prime is 54921656239. The reversal of 54921656221 is 12265612945.

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

It is a cyclic number.

It is not a de Polignac number, because 54921656221 - 2¹¹ = 54921654173 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 (54921656821) 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, 10470 + ... + 331591.

It is an arithmetic number, because the mean of its divisors is an integer number (6900758788).

Almost surely, 2^54921656221 is an apocalyptic number.

It is an amenable number.

54921656221 is a deficient number, since it is larger than the sum of its proper divisors (284414083).

54921656221 is a wasteful number, since it uses less digits than its factorization.

54921656221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342891.

The product of its digits is 259200, while the sum is 43.

The spelling of 54921656221 in words is "fifty-four billion, nine hundred twenty-one million, six hundred fifty-six thousand, two hundred twenty-one".