201140021 has 2 divisors, whose sum is σ = 201140022. Its totient is φ = 201140020.

The previous prime is 201139993. The next prime is 201140041. The reversal of 201140021 is 120041102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174504100 + 26635921 = 13210^2 + 5161^2 .

It is a cyclic number.

It is not a de Polignac number, because 201140021 - 2⁶ = 201139957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201139984 and 201140011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201140041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100570010 + 100570011.

It is an arithmetic number, because the mean of its divisors is an integer number (100570011).

Almost surely, 2^201140021 is an apocalyptic number.

It is an amenable number.

201140021 is a deficient number, since it is larger than the sum of its proper divisors (1).

201140021 is an equidigital number, since it uses as much as digits as its factorization.

201140021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 201140021 is about 14182.3841789736. The cubic root of 201140021 is about 585.9125902930.

Adding to 201140021 its reverse (120041102), we get a palindrome (321181123).

The spelling of 201140021 in words is "two hundred one million, one hundred forty thousand, twenty-one".