211465021 has 2 divisors, whose sum is σ = 211465022. Its totient is φ = 211465020.

The previous prime is 211464973. The next prime is 211465039. The reversal of 211465021 is 120564112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116402521 + 95062500 = 10789^2 + 9750^2 .

It is a cyclic number.

It is not a de Polignac number, because 211465021 - 2⁷ = 211464893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211464983 and 211465001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211465061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105732510 + 105732511.

It is an arithmetic number, because the mean of its divisors is an integer number (105732511).

Almost surely, 2^211465021 is an apocalyptic number.

It is an amenable number.

211465021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211465021 is an equidigital number, since it uses as much as digits as its factorization.

211465021 is an evil number, because the sum of its binary digits is even.

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

The square root of 211465021 is about 14541.8369197292. The cubic root of 211465021 is about 595.7712109629.

Subtracting from 211465021 its reverse (120564112), we obtain a palindrome (90900909).

The spelling of 211465021 in words is "two hundred eleven million, four hundred sixty-five thousand, twenty-one".