64212121 has 2 divisors, whose sum is σ = 64212122. Its totient is φ = 64212120.

The previous prime is 64212107. The next prime is 64212143. The reversal of 64212121 is 12121246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41744521 + 22467600 = 6461^2 + 4740^2 .

It is a cyclic number.

It is not a de Polignac number, because 64212121 - 2¹¹ = 64210073 is a prime.

It is not a weakly prime, because it can be changed into another prime (64212101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32106060 + 32106061.

It is an arithmetic number, because the mean of its divisors is an integer number (32106061).

Almost surely, 2^64212121 is an apocalyptic number.

It is an amenable number.

64212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

64212121 is an equidigital number, since it uses as much as digits as its factorization.

64212121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 19.

The square root of 64212121 is about 8013.2465954818. The cubic root of 64212121 is about 400.4414314166.

Adding to 64212121 its reverse (12121246), we get a palindrome (76333367).

The spelling of 64212121 in words is "sixty-four million, two hundred twelve thousand, one hundred twenty-one".