201100001021 has 2 divisors, whose sum is σ = 201100001022. Its totient is φ = 201100001020.

The previous prime is 201100000979. The next prime is 201100001027. The reversal of 201100001021 is 120100001102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192010476100 + 9089524921 = 438190^2 + 95339^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201100001021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201100001027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100550000510 + 100550000511.

It is an arithmetic number, because the mean of its divisors is an integer number (100550000511).

Almost surely, 2^201100001021 is an apocalyptic number.

It is an amenable number.

201100001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201100001021 is an equidigital number, since it uses as much as digits as its factorization.

201100001021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 201100001021 its reverse (120100001102), we get a palindrome (321200002123).

The spelling of 201100001021 in words is "two hundred one billion, one hundred million, one thousand, twenty-one".