212225401 has 2 divisors, whose sum is σ = 212225402. Its totient is φ = 212225400.

The previous prime is 212225359. The next prime is 212225407. The reversal of 212225401 is 104522212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156275001 + 55950400 = 12501^2 + 7480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212225401 is a prime.

It is a super-2 number, since 2×212225401² = 90079241659221602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212225407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106112700 + 106112701.

It is an arithmetic number, because the mean of its divisors is an integer number (106112701).

Almost surely, 2^212225401 is an apocalyptic number.

It is an amenable number.

212225401 is a deficient number, since it is larger than the sum of its proper divisors (1).

212225401 is an equidigital number, since it uses as much as digits as its factorization.

212225401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 212225401 is about 14567.9580243766. The cubic root of 212225401 is about 596.4844425835.

Adding to 212225401 its reverse (104522212), we get a palindrome (316747613).

The spelling of 212225401 in words is "two hundred twelve million, two hundred twenty-five thousand, four hundred one".