2121552342545 has 16 divisors (see below), whose sum is σ = 2551689511488. Its totient is φ = 1693358479680.

The previous prime is 2121552342529. The next prime is 2121552342563. The reversal of 2121552342545 is 5452432551212.

It is not a de Polignac number, because 2121552342545 - 2⁴ = 2121552342529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16718435 + ... + 16844855.

It is an arithmetic number, because the mean of its divisors is an integer number (159480594468).

Almost surely, 2^{2121552342545} is an apocalyptic number.

It is an amenable number.

2121552342545 is a deficient number, since it is larger than the sum of its proper divisors (430137168943).

2121552342545 is a wasteful number, since it uses less digits than its factorization.

2121552342545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134080.

The product of its digits is 480000, while the sum is 41.

Adding to 2121552342545 its reverse (5452432551212), we get a palindrome (7573984893757).

The spelling of 2121552342545 in words is "two trillion, one hundred twenty-one billion, five hundred fifty-two million, three hundred forty-two thousand, five hundred forty-five".