64210121 has 2 divisors, whose sum is σ = 64210122. Its totient is φ = 64210120.

The previous prime is 64210117. The next prime is 64210123. The reversal of 64210121 is 12101246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57214096 + 6996025 = 7564^2 + 2645^2 .

It is a cyclic number.

It is not a de Polignac number, because 64210121 - 2² = 64210117 is a prime.

Together with 64210123, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64210121.

It is not a weakly prime, because it can be changed into another prime (64210123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32105060 + 32105061.

It is an arithmetic number, because the mean of its divisors is an integer number (32105061).

Almost surely, 2^64210121 is an apocalyptic number.

It is an amenable number.

64210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

64210121 is an equidigital number, since it uses as much as digits as its factorization.

64210121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 64210121 is about 8013.1218011459. The cubic root of 64210121 is about 400.4372738880.

Adding to 64210121 its reverse (12101246), we get a palindrome (76311367).

The spelling of 64210121 in words is "sixty-four million, two hundred ten thousand, one hundred twenty-one".