2021172015 has 16 divisors (see below), whose sum is σ = 3239270496. Its totient is φ = 1076160000.

The previous prime is 2021171993. The next prime is 2021172017. The reversal of 2021172015 is 5102711202.

It is a de Polignac number, because none of the positive numbers 2^k-2021172015 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021171982 and 2021172000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021172017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103086 + ... + 121115.

It is an arithmetic number, because the mean of its divisors is an integer number (202454406).

Almost surely, 2^2021172015 is an apocalyptic number.

2021172015 is a deficient number, since it is larger than the sum of its proper divisors (1218098481).

2021172015 is a wasteful number, since it uses less digits than its factorization.

2021172015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224810.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 2021172015 is about 44957.4467135312. The cubic root of 2021172015 is about 1264.3512981578.

Adding to 2021172015 its reverse (5102711202), we get a palindrome (7123883217).

The spelling of 2021172015 in words is "two billion, twenty-one million, one hundred seventy-two thousand, fifteen".