212021210121 has 32 divisors (see below), whose sum is σ = 340113653760. Its totient is φ = 114768441216.

The previous prime is 212021210101. The next prime is 212021210129. The reversal of 212021210121 is 121012120212.

212021210121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212021210121 - 2¹⁵ = 212021177353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212021210121.

It is not an unprimeable number, because it can be changed into a prime (212021210129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9140280 + ... + 9163446.

It is an arithmetic number, because the mean of its divisors is an integer number (10628551680).

Almost surely, 2^212021210121 is an apocalyptic number.

212021210121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212021210121 is a deficient number, since it is larger than the sum of its proper divisors (128092443639).

212021210121 is a wasteful number, since it uses less digits than its factorization.

212021210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46133.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 212021210121 its reverse (121012120212), we get a palindrome (333033330333).

The spelling of 212021210121 in words is "two hundred twelve billion, twenty-one million, two hundred ten thousand, one hundred twenty-one".