64120021 has 8 divisors (see below), whose sum is σ = 76466304. Its totient is φ = 52570320.

The previous prime is 64119977. The next prime is 64120027. The reversal of 64120021 is 12002146.

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

It is a cyclic number.

It is not a de Polignac number, because 64120021 - 2⁷ = 64119893 is a prime.

It is a super-2 number, since 2×64120021² = 8222754186080882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64119977 and 64120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64120027) 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, 198970 + ... + 199291.

It is an arithmetic number, because the mean of its divisors is an integer number (9558288).

Almost surely, 2^64120021 is an apocalyptic number.

It is an amenable number.

64120021 is a deficient number, since it is larger than the sum of its proper divisors (12346283).

64120021 is a wasteful number, since it uses less digits than its factorization.

64120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398291.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 64120021 is about 8007.4977989382. The cubic root of 64120021 is about 400.2498876080.

Adding to 64120021 its reverse (12002146), we get a palindrome (76122167).

The spelling of 64120021 in words is "sixty-four million, one hundred twenty thousand, twenty-one".