64210221 has 12 divisors (see below), whose sum is σ = 92899872. Its totient is φ = 42736776.

The previous prime is 64210219. The next prime is 64210243. The reversal of 64210221 is 12201246.

64210221 is a `hidden beast` number, since 642 + 1 + 0 + 2 + 21 = 666.

It is not a de Polignac number, because 64210221 - 2¹ = 64210219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64210194 and 64210203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64210261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310 + ... + 11336.

It is an arithmetic number, because the mean of its divisors is an integer number (7741656).

Almost surely, 2^64210221 is an apocalyptic number.

It is an amenable number.

64210221 is a deficient number, since it is larger than the sum of its proper divisors (28689651).

64210221 is a wasteful number, since it uses less digits than its factorization.

64210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11680 (or 11677 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 64210221 is about 8013.1280409089. The cubic root of 64210221 is about 400.4374817665.

Adding to 64210221 its reverse (12201246), we get a palindrome (76411467).

The spelling of 64210221 in words is "sixty-four million, two hundred ten thousand, two hundred twenty-one".