212021001121 has 4 divisors (see below), whose sum is σ = 223180001200. Its totient is φ = 200862001044.

The previous prime is 212021001109. The next prime is 212021001161. The reversal of 212021001121 is 121100120212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212021001121 - 2²⁷ = 211886783393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212021001161) 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 3 ways as a sum of consecutive naturals, for example, 5579500011 + ... + 5579500048.

It is an arithmetic number, because the mean of its divisors is an integer number (55795000300).

Almost surely, 2^212021001121 is an apocalyptic number.

It is an amenable number.

212021001121 is a deficient number, since it is larger than the sum of its proper divisors (11159000079).

212021001121 is a wasteful number, since it uses less digits than its factorization.

212021001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11159000078.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212021001121 its reverse (121100120212), we get a palindrome (333121121333).

The spelling of 212021001121 in words is "two hundred twelve billion, twenty-one million, one thousand, one hundred twenty-one".