2154123101999 has 32 divisors (see below), whose sum is σ = 2549292362496. Its totient is φ = 1797944440320.

The previous prime is 2154123101983. The next prime is 2154123102041. The reversal of 2154123101999 is 9991013214512.

It is a cyclic number.

It is not a de Polignac number, because 2154123101999 - 2⁴ = 2154123101983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154123101959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6158069 + ... + 6498465.

It is an arithmetic number, because the mean of its divisors is an integer number (79665386328).

Almost surely, 2^{2154123101999} is an apocalyptic number.

2154123101999 is a deficient number, since it is larger than the sum of its proper divisors (395169260497).

2154123101999 is a wasteful number, since it uses less digits than its factorization.

2154123101999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341255.

The product of its (nonzero) digits is 174960, while the sum is 47.

The spelling of 2154123101999 in words is "two trillion, one hundred fifty-four billion, one hundred twenty-three million, one hundred one thousand, nine hundred ninety-nine".