2154512321 has 16 divisors (see below), whose sum is σ = 2391513600. Its totient is φ = 1928292480.

The previous prime is 2154512287. The next prime is 2154512389. The reversal of 2154512321 is 1232154512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2154512321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2154514321) 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, 74480 + ... + 99278.

It is an arithmetic number, because the mean of its divisors is an integer number (149469600).

Almost surely, 2^2154512321 is an apocalyptic number.

It is an amenable number.

2154512321 is a deficient number, since it is larger than the sum of its proper divisors (237001279).

2154512321 is a wasteful number, since it uses less digits than its factorization.

2154512321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25016.

The product of its digits is 2400, while the sum is 26.

The square root of 2154512321 is about 46416.7245828484. The cubic root of 2154512321 is about 1291.5651776761.

Adding to 2154512321 its reverse (1232154512), we get a palindrome (3386666833).

The spelling of 2154512321 in words is "two billion, one hundred fifty-four million, five hundred twelve thousand, three hundred twenty-one".