212745121 has 2 divisors, whose sum is σ = 212745122. Its totient is φ = 212745120.

The previous prime is 212745103. The next prime is 212745139. The reversal of 212745121 is 121547212.

It is a balanced prime because it is at equal distance from previous prime (212745103) and next prime (212745139).

It can be written as a sum of positive squares in only one way, i.e., 194212096 + 18533025 = 13936^2 + 4305^2 .

It is a cyclic number.

It is not a de Polignac number, because 212745121 - 2⁷ = 212744993 is a prime.

It is not a weakly prime, because it can be changed into another prime (212745151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106372560 + 106372561.

It is an arithmetic number, because the mean of its divisors is an integer number (106372561).

Almost surely, 2^212745121 is an apocalyptic number.

It is an amenable number.

212745121 is a deficient number, since it is larger than the sum of its proper divisors (1).

212745121 is an equidigital number, since it uses as much as digits as its factorization.

212745121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 25.

The square root of 212745121 is about 14585.7848948900. The cubic root of 212745121 is about 596.9709570459.

The spelling of 212745121 in words is "two hundred twelve million, seven hundred forty-five thousand, one hundred twenty-one".