54123658921 has 2 divisors, whose sum is σ = 54123658922. Its totient is φ = 54123658920.

The previous prime is 54123658859. The next prime is 54123658987. The reversal of 54123658921 is 12985632145.

54123658921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34073098921 + 20050560000 = 184589^2 + 141600^2 .

It is a cyclic number.

It is not a de Polignac number, because 54123658921 - 2⁹ = 54123658409 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (54123656921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27061829460 + 27061829461.

It is an arithmetic number, because the mean of its divisors is an integer number (27061829461).

Almost surely, 2^54123658921 is an apocalyptic number.

It is an amenable number.

54123658921 is a deficient number, since it is larger than the sum of its proper divisors (1).

54123658921 is an equidigital number, since it uses as much as digits as its factorization.

54123658921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 46.

The spelling of 54123658921 in words is "fifty-four billion, one hundred twenty-three million, six hundred fifty-eight thousand, nine hundred twenty-one".