65420221 has 4 divisors (see below), whose sum is σ = 65919744. Its totient is φ = 64920700.

The previous prime is 65420189. The next prime is 65420227. The reversal of 65420221 is 12202456.

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 65420221 - 2⁵ = 65420189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65420192 and 65420201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65420227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249565 + ... + 249826.

It is an arithmetic number, because the mean of its divisors is an integer number (16479936).

Almost surely, 2^65420221 is an apocalyptic number.

It is an amenable number.

65420221 is a deficient number, since it is larger than the sum of its proper divisors (499523).

65420221 is a wasteful number, since it uses less digits than its factorization.

65420221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499522.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 65420221 is about 8088.2767633162. The cubic root of 65420221 is about 402.9371734902.

Adding to 65420221 its reverse (12202456), we get a palindrome (77622677).

The spelling of 65420221 in words is "sixty-five million, four hundred twenty thousand, two hundred twenty-one".