2121254517 has 16 divisors (see below), whose sum is σ = 2874352640. Its totient is φ = 1391290992.

The previous prime is 2121254501. The next prime is 2121254519. The reversal of 2121254517 is 7154521212.

It is a happy number.

It is not a de Polignac number, because 2121254517 - 2⁴ = 2121254501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121254519) 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, 51258 + ... + 82884.

It is an arithmetic number, because the mean of its divisors is an integer number (179647040).

Almost surely, 2^2121254517 is an apocalyptic number.

It is an amenable number.

2121254517 is a deficient number, since it is larger than the sum of its proper divisors (753098123).

2121254517 is a wasteful number, since it uses less digits than its factorization.

2121254517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31992.

The product of its digits is 5600, while the sum is 30.

The square root of 2121254517 is about 46057.0789021623. The cubic root of 2121254517 is about 1284.8850027548.

Adding to 2121254517 its reverse (7154521212), we get a palindrome (9275775729).

The spelling of 2121254517 in words is "two billion, one hundred twenty-one million, two hundred fifty-four thousand, five hundred seventeen".