201001210222121 has 4 divisors (see below), whose sum is σ = 201001414361472. Its totient is φ = 201001006082772.

The previous prime is 201001210222097. The next prime is 201001210222129. The reversal of 201001210222121 is 121222012100102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201001210222121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201001210222121.

It is not an unprimeable number, because it can be changed into a prime (201001210222129) 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, 100585541 + ... + 102564386.

It is an arithmetic number, because the mean of its divisors is an integer number (50250353590368).

Almost surely, 2^{201001210222121} is an apocalyptic number.

It is an amenable number.

201001210222121 is a deficient number, since it is larger than the sum of its proper divisors (204139351).

201001210222121 is an equidigital number, since it uses as much as digits as its factorization.

201001210222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204139350.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201001210222121 its reverse (121222012100102), we get a palindrome (322223222322223).

The spelling of 201001210222121 in words is "two hundred one trillion, one billion, two hundred ten million, two hundred twenty-two thousand, one hundred twenty-one".