211625221 has 2 divisors, whose sum is σ = 211625222. Its totient is φ = 211625220.

The previous prime is 211625207. The next prime is 211625243. The reversal of 211625221 is 122526112.

It is an a-pointer prime, because the next prime (211625243) can be obtained adding 211625221 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158130625 + 53494596 = 12575^2 + 7314^2 .

It is a cyclic number.

It is not a de Polignac number, because 211625221 - 2⁹ = 211624709 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 211625192 and 211625201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211625201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105812610 + 105812611.

It is an arithmetic number, because the mean of its divisors is an integer number (105812611).

Almost surely, 2^211625221 is an apocalyptic number.

It is an amenable number.

211625221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211625221 is an equidigital number, since it uses as much as digits as its factorization.

211625221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 22.

The square root of 211625221 is about 14547.3441218664. The cubic root of 211625221 is about 595.9216195366.

The spelling of 211625221 in words is "two hundred eleven million, six hundred twenty-five thousand, two hundred twenty-one".