201012012121 has 4 divisors (see below), whose sum is σ = 201397832244. Its totient is φ = 200626192000.

The previous prime is 201012012109. The next prime is 201012012133. The reversal of 201012012121 is 121210210102.

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

It is an interprime number because it is at equal distance from previous prime (201012012109) and next prime (201012012133).

It can be written as a sum of positive squares in 2 ways, for example, as 147023166096 + 53988846025 = 383436^2 + 232355^2 .

It is a cyclic number.

It is not a de Polignac number, because 201012012121 - 2²⁷ = 200877794393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201012012161) 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, 192909280 + ... + 192910321.

It is an arithmetic number, because the mean of its divisors is an integer number (50349458061).

Almost surely, 2^201012012121 is an apocalyptic number.

It is an amenable number.

201012012121 is a deficient number, since it is larger than the sum of its proper divisors (385820123).

201012012121 is an equidigital number, since it uses as much as digits as its factorization.

201012012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385820122.

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

Adding to 201012012121 its reverse (121210210102), we get a palindrome (322222222223).

The spelling of 201012012121 in words is "two hundred one billion, twelve million, twelve thousand, one hundred twenty-one".