2021572215065 has 16 divisors (see below), whose sum is σ = 2749992974400. Its totient is φ = 1414282099392.

The previous prime is 2021572215043. The next prime is 2021572215071. The reversal of 2021572215065 is 5605122751202.

It is not a de Polignac number, because 2021572215065 - 2¹⁰ = 2021572214041 is a prime.

It is a super-2 number, since 2×2021572215065² (a number of 25 digits) contains 22 as substring.

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, 818449055 + ... + 818451524.

It is an arithmetic number, because the mean of its divisors is an integer number (171874560900).

Almost surely, 2^{2021572215065} is an apocalyptic number.

It is an amenable number.

2021572215065 is a deficient number, since it is larger than the sum of its proper divisors (728420759335).

2021572215065 is a wasteful number, since it uses less digits than its factorization.

2021572215065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636900616.

The product of its (nonzero) digits is 84000, while the sum is 38.

Adding to 2021572215065 its reverse (5605122751202), we get a palindrome (7626694966267).

The spelling of 2021572215065 in words is "two trillion, twenty-one billion, five hundred seventy-two million, two hundred fifteen thousand, sixty-five".