212021121121 has 16 divisors (see below), whose sum is σ = 219357642240. Its totient is φ = 204798787200.

The previous prime is 212021121107. The next prime is 212021121131. The reversal of 212021121121 is 121121120212.

It is a cyclic number.

It is not a de Polignac number, because 212021121121 - 2¹⁵ = 212021088353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021121095 and 212021121104.

It is not an unprimeable number, because it can be changed into a prime (212021121131) 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, 3719725 + ... + 3776293.

It is an arithmetic number, because the mean of its divisors is an integer number (13709852640).

Almost surely, 2^212021121121 is an apocalyptic number.

It is an amenable number.

212021121121 is a deficient number, since it is larger than the sum of its proper divisors (7336521119).

212021121121 is a wasteful number, since it uses less digits than its factorization.

212021121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57576.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212021121121 its reverse (121121120212), we get a palindrome (333142241333).

Subtracting from 212021121121 its reverse (121121120212), we obtain a palindrome (90900000909).

The spelling of 212021121121 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, one hundred twenty-one".