201209948021 has 2 divisors, whose sum is σ = 201209948022. Its totient is φ = 201209948020.

The previous prime is 201209947903. The next prime is 201209948033. The reversal of 201209948021 is 120849902102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178645702225 + 22564245796 = 422665^2 + 150214^2 .

It is a cyclic number.

It is not a de Polignac number, because 201209948021 - 2¹⁰ = 201209946997 is a prime.

It is a super-2 number, since 2×201209948021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201209948041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100604974010 + 100604974011.

It is an arithmetic number, because the mean of its divisors is an integer number (100604974011).

Almost surely, 2^201209948021 is an apocalyptic number.

It is an amenable number.

201209948021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201209948021 is an equidigital number, since it uses as much as digits as its factorization.

201209948021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 201209948021 in words is "two hundred one billion, two hundred nine million, nine hundred forty-eight thousand, twenty-one".