212221210121121 has 16 divisors (see below), whose sum is σ = 286160940348480. Its totient is φ = 139881365352960.

The previous prime is 212221210121111. The next prime is 212221210121153. The reversal of 212221210121121 is 121121012122212.

It is not a de Polignac number, because 212221210121121 - 2¹⁵ = 212221210088353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212221210121101) by changing a digit.

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, 23922600 + ... + 31571081.

It is an arithmetic number, because the mean of its divisors is an integer number (17885058771780).

Almost surely, 2^{212221210121121} is an apocalyptic number.

It is an amenable number.

212221210121121 is a deficient number, since it is larger than the sum of its proper divisors (73939730227359).

212221210121121 is a wasteful number, since it uses less digits than its factorization.

212221210121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55508096.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 212221210121121 its reverse (121121012122212), we get a palindrome (333342222243333).

The spelling of 212221210121121 in words is "two hundred twelve trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty-one thousand, one hundred twenty-one".