201321002021 has 2 divisors, whose sum is σ = 201321002022. Its totient is φ = 201321002020.

The previous prime is 201321001979. The next prime is 201321002027. The reversal of 201321002021 is 120200123102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159371817796 + 41949184225 = 399214^2 + 204815^2 .

It is a cyclic number.

It is not a de Polignac number, because 201321002021 - 2¹⁸ = 201320739877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201321001987 and 201321002005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201321002027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100660501010 + 100660501011.

It is an arithmetic number, because the mean of its divisors is an integer number (100660501011).

Almost surely, 2^201321002021 is an apocalyptic number.

It is an amenable number.

201321002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201321002021 is an equidigital number, since it uses as much as digits as its factorization.

201321002021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 201321002021 its reverse (120200123102), we get a palindrome (321521125123).

The spelling of 201321002021 in words is "two hundred one billion, three hundred twenty-one million, two thousand, twenty-one".