64434021 has 4 divisors (see below), whose sum is σ = 85912032. Its totient is φ = 42956012.

The previous prime is 64433989. The next prime is 64434031. The reversal of 64434021 is 12043446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64434021 - 2⁵ = 64433989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64433982 and 64434000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64434031) 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, 10739001 + ... + 10739006.

It is an arithmetic number, because the mean of its divisors is an integer number (21478008).

Almost surely, 2^64434021 is an apocalyptic number.

It is an amenable number.

64434021 is a deficient number, since it is larger than the sum of its proper divisors (21478011).

64434021 is a wasteful number, since it uses less digits than its factorization.

64434021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21478010.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 64434021 is about 8027.0804779820. The cubic root of 64434021 is about 400.9021740917.

Adding to 64434021 its reverse (12043446), we get a palindrome (76477467).

The spelling of 64434021 in words is "sixty-four million, four hundred thirty-four thousand, twenty-one".