201201211021 has 2 divisors, whose sum is σ = 201201211022. Its totient is φ = 201201211020.

The previous prime is 201201210989. The next prime is 201201211027. The reversal of 201201211021 is 120112102102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197309198025 + 3892012996 = 444195^2 + 62386^2 .

It is a cyclic number.

It is not a de Polignac number, because 201201211021 - 2⁵ = 201201210989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201201210992 and 201201211010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201201211027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100600605510 + 100600605511.

It is an arithmetic number, because the mean of its divisors is an integer number (100600605511).

Almost surely, 2^201201211021 is an apocalyptic number.

It is an amenable number.

201201211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201201211021 is an equidigital number, since it uses as much as digits as its factorization.

201201211021 is an evil number, because the sum of its binary digits is even.

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

Adding to 201201211021 its reverse (120112102102), we get a palindrome (321313313123).

The spelling of 201201211021 in words is "two hundred one billion, two hundred one million, two hundred eleven thousand, twenty-one".