201002120021 has 2 divisors, whose sum is σ = 201002120022. Its totient is φ = 201002120020.

The previous prime is 201002119949. The next prime is 201002120041. The reversal of 201002120021 is 120021200102.

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., 200669057521 + 333062500 = 447961^2 + 18250^2 .

It is a cyclic number.

It is not a de Polignac number, because 201002120021 - 2¹⁸ = 201001857877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201002119984 and 201002120011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201002120041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100501060010 + 100501060011.

It is an arithmetic number, because the mean of its divisors is an integer number (100501060011).

Almost surely, 2^201002120021 is an apocalyptic number.

It is an amenable number.

201002120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201002120021 is an equidigital number, since it uses as much as digits as its factorization.

201002120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 201002120021 its reverse (120021200102), we get a palindrome (321023320123).

The spelling of 201002120021 in words is "two hundred one billion, two million, one hundred twenty thousand, twenty-one".