65421111 has 8 divisors (see below), whose sum is σ = 99689344. Its totient is φ = 37383480.

The previous prime is 65421107. The next prime is 65421113. The reversal of 65421111 is 11112456.

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

It is not a de Polignac number, because 65421111 - 2² = 65421107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 3115291 = 65421111 / (6 + 5 + 4 + 2 + 1 + 1 + 1 + 1).

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65421113) 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, 1557625 + ... + 1557666.

It is an arithmetic number, because the mean of its divisors is an integer number (12461168).

Almost surely, 2^65421111 is an apocalyptic number.

65421111 is a deficient number, since it is larger than the sum of its proper divisors (34268233).

65421111 is a wasteful number, since it uses less digits than its factorization.

65421111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3115301.

The product of its digits is 240, while the sum is 21.

The square root of 65421111 is about 8088.3317810288. The cubic root of 65421111 is about 402.9390007156.

Adding to 65421111 its reverse (11112456), we get a palindrome (76533567).

The spelling of 65421111 in words is "sixty-five million, four hundred twenty-one thousand, one hundred eleven".