64300021 has 2 divisors, whose sum is σ = 64300022. Its totient is φ = 64300020.

The previous prime is 64299997. The next prime is 64300031. The reversal of 64300021 is 12000346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62583921 + 1716100 = 7911^2 + 1310^2 .

It is a cyclic number.

It is not a de Polignac number, because 64300021 - 2²¹ = 62202869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64299968 and 64300004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64300031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32150010 + 32150011.

It is an arithmetic number, because the mean of its divisors is an integer number (32150011).

Almost surely, 2^64300021 is an apocalyptic number.

It is an amenable number.

64300021 is a deficient number, since it is larger than the sum of its proper divisors (1).

64300021 is an equidigital number, since it uses as much as digits as its factorization.

64300021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 64300021 is about 8018.7293881263. The cubic root of 64300021 is about 400.6240695865.

Adding to 64300021 its reverse (12000346), we get a palindrome (76300367).

The spelling of 64300021 in words is "sixty-four million, three hundred thousand, twenty-one".