201020021957 has 2 divisors, whose sum is σ = 201020021958. Its totient is φ = 201020021956.

The previous prime is 201020021903. The next prime is 201020022061. The reversal of 201020021957 is 759120020102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200989925761 + 30096196 = 448319^2 + 5486^2 .

It is a cyclic number.

It is not a de Polignac number, because 201020021957 - 2⁸ = 201020021701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201020021857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510010978 + 100510010979.

It is an arithmetic number, because the mean of its divisors is an integer number (100510010979).

Almost surely, 2^201020021957 is an apocalyptic number.

It is an amenable number.

201020021957 is a deficient number, since it is larger than the sum of its proper divisors (1).

201020021957 is an equidigital number, since it uses as much as digits as its factorization.

201020021957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 29.

The spelling of 201020021957 in words is "two hundred one billion, twenty million, twenty-one thousand, nine hundred fifty-seven".