212135501 has 2 divisors, whose sum is σ = 212135502. Its totient is φ = 212135500.

The previous prime is 212135489. The next prime is 212135507. The reversal of 212135501 is 105531212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125664100 + 86471401 = 11210^2 + 9299^2 .

It is a cyclic number.

It is not a de Polignac number, because 212135501 - 2¹⁰ = 212134477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212135507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106067750 + 106067751.

It is an arithmetic number, because the mean of its divisors is an integer number (106067751).

Almost surely, 2^212135501 is an apocalyptic number.

It is an amenable number.

212135501 is a deficient number, since it is larger than the sum of its proper divisors (1).

212135501 is an equidigital number, since it uses as much as digits as its factorization.

212135501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 212135501 is about 14564.8721587249. The cubic root of 212135501 is about 596.4002058479.

Adding to 212135501 its reverse (105531212), we get a palindrome (317666713).

The spelling of 212135501 in words is "two hundred twelve million, one hundred thirty-five thousand, five hundred one".