2154121287 has 8 divisors (see below), whose sum is σ = 2872425840. Its totient is φ = 1435948800.

The previous prime is 2154121261. The next prime is 2154121309. The reversal of 2154121287 is 7821214512.

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

It is not a de Polignac number, because 2154121287 - 2⁶ = 2154121223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154121987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15037 + ... + 67337.

It is an arithmetic number, because the mean of its divisors is an integer number (359053230).

Almost surely, 2^2154121287 is an apocalyptic number.

2154121287 is a deficient number, since it is larger than the sum of its proper divisors (718304553).

2154121287 is a wasteful number, since it uses less digits than its factorization.

2154121287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66033.

The product of its digits is 8960, while the sum is 33.

The square root of 2154121287 is about 46412.5121815228. The cubic root of 2154121287 is about 1291.4870352507.

Adding to 2154121287 its reverse (7821214512), we get a palindrome (9975335799).

The spelling of 2154121287 in words is "two billion, one hundred fifty-four million, one hundred twenty-one thousand, two hundred eighty-seven".