65421501 has 16 divisors (see below), whose sum is σ = 91576320. Its totient is φ = 41488560.

The previous prime is 65421487. The next prime is 65421523. The reversal of 65421501 is 10512456.

It is not a de Polignac number, because 65421501 - 2⁵ = 65421469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65421571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475 + ... + 11448.

It is an arithmetic number, because the mean of its divisors is an integer number (5723520).

Almost surely, 2^65421501 is an apocalyptic number.

It is an amenable number.

65421501 is a deficient number, since it is larger than the sum of its proper divisors (26154819).

65421501 is a wasteful number, since it uses less digits than its factorization.

65421501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12016.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 65421501 is about 8088.3558897961. The cubic root of 65421501 is about 402.9398014046.

Adding to 65421501 its reverse (10512456), we get a palindrome (75933957).

It can be divided in two parts, 654 and 21501, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 65421501 in words is "sixty-five million, four hundred twenty-one thousand, five hundred one".