65213121 has 4 divisors (see below), whose sum is σ = 86950832. Its totient is φ = 43475412.

The previous prime is 65213089. The next prime is 65213123. The reversal of 65213121 is 12131256.

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 not a de Polignac number, because 65213121 - 2⁵ = 65213089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65213123) 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, 10868851 + ... + 10868856.

It is an arithmetic number, because the mean of its divisors is an integer number (21737708).

Almost surely, 2^65213121 is an apocalyptic number.

It is an amenable number.

65213121 is a deficient number, since it is larger than the sum of its proper divisors (21737711).

65213121 is a wasteful number, since it uses less digits than its factorization.

65213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21737710.

The product of its digits is 360, while the sum is 21.

The square root of 65213121 is about 8075.4641352680. The cubic root of 65213121 is about 402.5115329180.

Adding to 65213121 its reverse (12131256), we get a palindrome (77344377).

The spelling of 65213121 in words is "sixty-five million, two hundred thirteen thousand, one hundred twenty-one".