2165512121006 has 32 divisors (see below), whose sum is σ = 3548029570848. Its totient is φ = 985264243200.

The previous prime is 2165512120991. The next prime is 2165512121009. The reversal of 2165512121006 is 6001212155612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165512121009) 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, 111695 + ... + 2084106.

It is an arithmetic number, because the mean of its divisors is an integer number (110875924089).

Almost surely, 2^{2165512121006} is an apocalyptic number.

2165512121006 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2165512121006 is a deficient number, since it is larger than the sum of its proper divisors (1382517449842).

2165512121006 is a wasteful number, since it uses less digits than its factorization.

2165512121006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196356.

The product of its (nonzero) digits is 7200, while the sum is 32.

Adding to 2165512121006 its reverse (6001212155612), we get a palindrome (8166724276618).

The spelling of 2165512121006 in words is "two trillion, one hundred sixty-five billion, five hundred twelve million, one hundred twenty-one thousand, six".