54391307721 has 16 divisors (see below), whose sum is σ = 74431195200. Its totient is φ = 35318308608.

The previous prime is 54391307669. The next prime is 54391307731. The reversal of 54391307721 is 12770319345.

It is not a de Polignac number, because 54391307721 - 2¹⁷ = 54391176649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (54391307731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1502356 + ... + 1538133.

It is an arithmetic number, because the mean of its divisors is an integer number (4651949700).

Almost surely, 2^54391307721 is an apocalyptic number.

It is an amenable number.

54391307721 is a deficient number, since it is larger than the sum of its proper divisors (20039887479).

54391307721 is a wasteful number, since it uses less digits than its factorization.

54391307721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040648.

The product of its (nonzero) digits is 158760, while the sum is 42.

The spelling of 54391307721 in words is "fifty-four billion, three hundred ninety-one million, three hundred seven thousand, seven hundred twenty-one".