212001012121 has 4 divisors (see below), whose sum is σ = 212030410852. Its totient is φ = 211971613392.

The previous prime is 212001012109. The next prime is 212001012143. The reversal of 212001012121 is 121210100212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 182756250000 + 29244762121 = 427500^2 + 171011^2 .

It is a cyclic number.

It is not a de Polignac number, because 212001012121 - 2⁹ = 212001011609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212001012161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14688546 + ... + 14702971.

It is an arithmetic number, because the mean of its divisors is an integer number (53007602713).

Almost surely, 2^212001012121 is an apocalyptic number.

It is an amenable number.

212001012121 is a deficient number, since it is larger than the sum of its proper divisors (29398731).

212001012121 is an equidigital number, since it uses as much as digits as its factorization.

212001012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29398730.

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

Adding to 212001012121 its reverse (121210100212), we get a palindrome (333211112333).

The spelling of 212001012121 in words is "two hundred twelve billion, one million, twelve thousand, one hundred twenty-one".