201102211021 has 2 divisors, whose sum is σ = 201102211022. Its totient is φ = 201102211020.

The previous prime is 201102210941. The next prime is 201102211027. The reversal of 201102211021 is 120112201102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200372616900 + 729594121 = 447630^2 + 27011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201102211021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201102210992 and 201102211010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201102211027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100551105510 + 100551105511.

It is an arithmetic number, because the mean of its divisors is an integer number (100551105511).

Almost surely, 2^201102211021 is an apocalyptic number.

It is an amenable number.

201102211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201102211021 is an equidigital number, since it uses as much as digits as its factorization.

201102211021 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 201102211021 its reverse (120112201102), we get a palindrome (321214412123).

The spelling of 201102211021 in words is "two hundred one billion, one hundred two million, two hundred eleven thousand, twenty-one".