10021311221 has 2 divisors, whose sum is σ = 10021311222. Its totient is φ = 10021311220.

The previous prime is 10021311199. The next prime is 10021311233. The reversal of 10021311221 is 12211312001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8804068900 + 1217242321 = 93830^2 + 34889^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021311221 - 2¹⁴ = 10021294837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10021311196 and 10021311205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10021311281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010655610 + 5010655611.

It is an arithmetic number, because the mean of its divisors is an integer number (5010655611).

Almost surely, 2^10021311221 is an apocalyptic number.

It is an amenable number.

10021311221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021311221 is an equidigital number, since it uses as much as digits as its factorization.

10021311221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 10021311221 its reverse (12211312001), we get a palindrome (22232623222).

The spelling of 10021311221 in words is "ten billion, twenty-one million, three hundred eleven thousand, two hundred twenty-one".