64020021 has 8 divisors (see below), whose sum is σ = 91926240. Its totient is φ = 39396912.

The previous prime is 64020013. The next prime is 64020031. The reversal of 64020021 is 12002046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64020021 - 2³ = 64020013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64020031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 820731 + ... + 820808.

It is an arithmetic number, because the mean of its divisors is an integer number (11490780).

Almost surely, 2^64020021 is an apocalyptic number.

It is an amenable number.

64020021 is a deficient number, since it is larger than the sum of its proper divisors (27906219).

64020021 is a wasteful number, since it uses less digits than its factorization.

64020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641555.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 64020021 is about 8001.2512146539. The cubic root of 64020021 is about 400.0417060680.

Adding to 64020021 its reverse (12002046), we get a palindrome (76022067).

The spelling of 64020021 in words is "sixty-four million, twenty thousand, twenty-one".