210022261 has 2 divisors, whose sum is σ = 210022262. Its totient is φ = 210022260.

The previous prime is 210022259. The next prime is 210022271. The reversal of 210022261 is 162220012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128119761 + 81902500 = 11319^2 + 9050^2 .

It is a cyclic number.

It is not a de Polignac number, because 210022261 - 2¹ = 210022259 is a prime.

Together with 210022259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210022271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105011130 + 105011131.

It is an arithmetic number, because the mean of its divisors is an integer number (105011131).

Almost surely, 2^210022261 is an apocalyptic number.

It is an amenable number.

210022261 is a deficient number, since it is larger than the sum of its proper divisors (1).

210022261 is an equidigital number, since it uses as much as digits as its factorization.

210022261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 210022261 is about 14492.1448033064. The cubic root of 210022261 is about 594.4131973353.

Adding to 210022261 its reverse (162220012), we get a palindrome (372242273).

The spelling of 210022261 in words is "two hundred ten million, twenty-two thousand, two hundred sixty-one".