20021331241 has 2 divisors, whose sum is σ = 20021331242. Its totient is φ = 20021331240.

The previous prime is 20021331193. The next prime is 20021331277. The reversal of 20021331241 is 14213312002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17787823641 + 2233507600 = 133371^2 + 47260^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021331241 - 2²⁷ = 19887113513 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021335241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010665620 + 10010665621.

It is an arithmetic number, because the mean of its divisors is an integer number (10010665621).

Almost surely, 2^20021331241 is an apocalyptic number.

It is an amenable number.

20021331241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021331241 is an equidigital number, since it uses as much as digits as its factorization.

20021331241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20021331241 its reverse (14213312002), we get a palindrome (34234643243).

The spelling of 20021331241 in words is "twenty billion, twenty-one million, three hundred thirty-one thousand, two hundred forty-one".