201021497 has 2 divisors, whose sum is σ = 201021498. Its totient is φ = 201021496.

The previous prime is 201021493. The next prime is 201021503. The reversal of 201021497 is 794120102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199685161 + 1336336 = 14131^2 + 1156^2 .

It is a cyclic number.

It is not a de Polignac number, because 201021497 - 2² = 201021493 is a prime.

It is a super-2 number, since 2×201021497² = 80819284512242018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201021493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510748 + 100510749.

It is an arithmetic number, because the mean of its divisors is an integer number (100510749).

Almost surely, 2^201021497 is an apocalyptic number.

It is an amenable number.

201021497 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021497 is an equidigital number, since it uses as much as digits as its factorization.

201021497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 201021497 is about 14178.2049992233. The cubic root of 201021497 is about 585.7974825050.

Adding to 201021497 its reverse (794120102), we get a palindrome (995141599).

The spelling of 201021497 in words is "two hundred one million, twenty-one thousand, four hundred ninety-seven".