65151021 has 24 divisors (see below), whose sum is σ = 99610560. Its totient is φ = 37729536.

The previous prime is 65151017. The next prime is 65151049. The reversal of 65151021 is 12015156.

It is not a de Polignac number, because 65151021 - 2² = 65151017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65151421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4840 + ... + 12398.

It is an arithmetic number, because the mean of its divisors is an integer number (4150440).

Almost surely, 2^65151021 is an apocalyptic number.

It is an amenable number.

65151021 is a deficient number, since it is larger than the sum of its proper divisors (34459539).

65151021 is a wasteful number, since it uses less digits than its factorization.

65151021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7605 (or 7592 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 65151021 is about 8071.6182392380. The cubic root of 65151021 is about 402.3837268147.

Adding to 65151021 its reverse (12015156), we get a palindrome (77166177).

The spelling of 65151021 in words is "sixty-five million, one hundred fifty-one thousand, twenty-one".