20010312221 has 2 divisors, whose sum is σ = 20010312222. Its totient is φ = 20010312220.

The previous prime is 20010312187. The next prime is 20010312239. The reversal of 20010312221 is 12221301002.

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., 10052268121 + 9958044100 = 100261^2 + 99790^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010312221 - 2¹⁸ = 20010050077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20010312196 and 20010312205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010314221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005156110 + 10005156111.

It is an arithmetic number, because the mean of its divisors is an integer number (10005156111).

Almost surely, 2^20010312221 is an apocalyptic number.

It is an amenable number.

20010312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010312221 is an equidigital number, since it uses as much as digits as its factorization.

20010312221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20010312221 its reverse (12221301002), we get a palindrome (32231613223).

The spelling of 20010312221 in words is "twenty billion, ten million, three hundred twelve thousand, two hundred twenty-one".