213222461 has 2 divisors, whose sum is σ = 213222462. Its totient is φ = 213222460.

The previous prime is 213222439. The next prime is 213222479. The reversal of 213222461 is 164222312.

It is a happy number.

213222461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146555236 + 66667225 = 12106^2 + 8165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213222461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213222481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106611230 + 106611231.

It is an arithmetic number, because the mean of its divisors is an integer number (106611231).

Almost surely, 2^213222461 is an apocalyptic number.

It is an amenable number.

213222461 is a deficient number, since it is larger than the sum of its proper divisors (1).

213222461 is an equidigital number, since it uses as much as digits as its factorization.

213222461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 213222461 is about 14602.1389186653. The cubic root of 213222461 is about 597.4171016448.

Adding to 213222461 its reverse (164222312), we get a palindrome (377444773).

The spelling of 213222461 in words is "two hundred thirteen million, two hundred twenty-two thousand, four hundred sixty-one".