64322021 has 4 divisors (see below), whose sum is σ = 66060492. Its totient is φ = 62583552.

The previous prime is 64321987. The next prime is 64322057. The reversal of 64322021 is 12022346.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56085121 + 8236900 = 7489^2 + 2870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64322021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64321984 and 64322002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64322081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869180 + ... + 869253.

It is an arithmetic number, because the mean of its divisors is an integer number (16515123).

Almost surely, 2^64322021 is an apocalyptic number.

It is an amenable number.

64322021 is a deficient number, since it is larger than the sum of its proper divisors (1738471).

64322021 is a wasteful number, since it uses less digits than its factorization.

64322021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738470.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 64322021 is about 8020.1010592137. The cubic root of 64322021 is about 400.6697550279.

Adding to 64322021 its reverse (12022346), we get a palindrome (76344367).

The spelling of 64322021 in words is "sixty-four million, three hundred twenty-two thousand, twenty-one".