10211022221 has 2 divisors, whose sum is σ = 10211022222. Its totient is φ = 10211022220.

The previous prime is 10211022197. The next prime is 10211022251. The reversal of 10211022221 is 12222011201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9074658121 + 1136364100 = 95261^2 + 33710^2 .

It is a cyclic number.

It is not a de Polignac number, because 10211022221 - 2²⁶ = 10143913357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10211022196 and 10211022205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10211022251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105511110 + 5105511111.

It is an arithmetic number, because the mean of its divisors is an integer number (5105511111).

Almost surely, 2^10211022221 is an apocalyptic number.

It is an amenable number.

10211022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10211022221 is an equidigital number, since it uses as much as digits as its factorization.

10211022221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10211022221 its reverse (12222011201), we get a palindrome (22433033422).

The spelling of 10211022221 in words is "ten billion, two hundred eleven million, twenty-two thousand, two hundred twenty-one".