2021542004155 has 16 divisors (see below), whose sum is σ = 2480744998944. Its totient is φ = 1580962510080.

The previous prime is 2021542004117. The next prime is 2021542004203. The reversal of 2021542004155 is 5514002451202.

It is not a de Polignac number, because 2021542004155 - 2⁹ = 2021542003643 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20281594 + ... + 20381023.

It is an arithmetic number, because the mean of its divisors is an integer number (155046562434).

Almost surely, 2^{2021542004155} is an apocalyptic number.

2021542004155 is a deficient number, since it is larger than the sum of its proper divisors (459202994789).

2021542004155 is a wasteful number, since it uses less digits than its factorization.

2021542004155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40662846.

The product of its (nonzero) digits is 16000, while the sum is 31.

Adding to 2021542004155 its reverse (5514002451202), we get a palindrome (7535544455357).

The spelling of 2021542004155 in words is "two trillion, twenty-one billion, five hundred forty-two million, four thousand, one hundred fifty-five".