201420134021 has 2 divisors, whose sum is σ = 201420134022. Its totient is φ = 201420134020.

The previous prime is 201420133979. The next prime is 201420134033. The reversal of 201420134021 is 120431024102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187237944100 + 14182189921 = 432710^2 + 119089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201420134021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201420133984 and 201420134002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201420134051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100710067010 + 100710067011.

It is an arithmetic number, because the mean of its divisors is an integer number (100710067011).

Almost surely, 2^201420134021 is an apocalyptic number.

It is an amenable number.

201420134021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201420134021 is an equidigital number, since it uses as much as digits as its factorization.

201420134021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 201420134021 its reverse (120431024102), we get a palindrome (321851158123).

The spelling of 201420134021 in words is "two hundred one billion, four hundred twenty million, one hundred thirty-four thousand, twenty-one".