201040342021 has 2 divisors, whose sum is σ = 201040342022. Its totient is φ = 201040342020.

The previous prime is 201040342003. The next prime is 201040342031. The reversal of 201040342021 is 120243040102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200247300100 + 793041921 = 447490^2 + 28161^2 .

It is a cyclic number.

It is not a de Polignac number, because 201040342021 - 2²⁵ = 201006787589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201040342021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201040342031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100520171010 + 100520171011.

It is an arithmetic number, because the mean of its divisors is an integer number (100520171011).

Almost surely, 2^201040342021 is an apocalyptic number.

It is an amenable number.

201040342021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201040342021 is an equidigital number, since it uses as much as digits as its factorization.

201040342021 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 19.

Adding to 201040342021 its reverse (120243040102), we get a palindrome (321283382123).

The spelling of 201040342021 in words is "two hundred one billion, forty million, three hundred forty-two thousand, twenty-one".