202240130021 has 2 divisors, whose sum is σ = 202240130022. Its totient is φ = 202240130020.

The previous prime is 202240130009. The next prime is 202240130149. The reversal of 202240130021 is 120031042202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155404677796 + 46835452225 = 394214^2 + 216415^2 .

It is a cyclic number.

It is not a de Polignac number, because 202240130021 - 2⁶ = 202240129957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202240130221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101120065010 + 101120065011.

It is an arithmetic number, because the mean of its divisors is an integer number (101120065011).

Almost surely, 2^202240130021 is an apocalyptic number.

It is an amenable number.

202240130021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202240130021 is an equidigital number, since it uses as much as digits as its factorization.

202240130021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 202240130021 its reverse (120031042202), we get a palindrome (322271172223).

The spelling of 202240130021 in words is "two hundred two billion, two hundred forty million, one hundred thirty thousand, twenty-one".