201020002121 has 8 divisors (see below), whose sum is σ = 206080537824. Its totient is φ = 195966971680.

The previous prime is 201020002111. The next prime is 201020002129. The reversal of 201020002121 is 121200020102.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201020002121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201020002129) 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 7 ways as a sum of consecutive naturals, for example, 1822055 + ... + 1929228.

It is an arithmetic number, because the mean of its divisors is an integer number (25760067228).

Almost surely, 2^201020002121 is an apocalyptic number.

It is an amenable number.

201020002121 is a deficient number, since it is larger than the sum of its proper divisors (5060535703).

201020002121 is a wasteful number, since it uses less digits than its factorization.

201020002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3752631.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 201020002121 its reverse (121200020102), we get a palindrome (322220022223).

The spelling of 201020002121 in words is "two hundred one billion, twenty million, two thousand, one hundred twenty-one".