201021000012121 has 2 divisors, whose sum is σ = 201021000012122. Its totient is φ = 201021000012120.

The previous prime is 201021000012061. The next prime is 201021000012233. The reversal of 201021000012121 is 121210000120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194258477776896 + 6762522235225 = 13937664^2 + 2600485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201021000012121 is a prime.

It is not a weakly prime, because it can be changed into another prime (201021000010121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510500006060 + 100510500006061.

It is an arithmetic number, because the mean of its divisors is an integer number (100510500006061).

Almost surely, 2^{201021000012121} is an apocalyptic number.

It is an amenable number.

201021000012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021000012121 is an equidigital number, since it uses as much as digits as its factorization.

201021000012121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 201021000012121 its reverse (121210000120102), we get a palindrome (322231000132223).

The spelling of 201021000012121 in words is "two hundred one trillion, twenty-one billion, twelve thousand, one hundred twenty-one".