65972421 has 16 divisors (see below), whose sum is σ = 99198400. Its totient is φ = 43323984.

The previous prime is 65972411. The next prime is 65972437. The reversal of 65972421 is 12427956.

It is not a de Polignac number, because 65972421 - 2²¹ = 63875269 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65972411) 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, 16426 + ... + 20043.

It is an arithmetic number, because the mean of its divisors is an integer number (6199900).

Almost surely, 2^65972421 is an apocalyptic number.

It is an amenable number.

65972421 is a deficient number, since it is larger than the sum of its proper divisors (33225979).

65972421 is a wasteful number, since it uses less digits than its factorization.

65972421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36545 (or 36539 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 65972421 is about 8122.3408571667. The cubic root of 65972421 is about 404.0677046449.

The spelling of 65972421 in words is "sixty-five million, nine hundred seventy-two thousand, four hundred twenty-one".