71653421 has 8 divisors (see below), whose sum is σ = 81949824. Its totient is φ = 61372080.

The previous prime is 71653409. The next prime is 71653433. The reversal of 71653421 is 12435617.

It is an interprime number because it is at equal distance from previous prime (71653409) and next prime (71653433).

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

It is not a de Polignac number, because 71653421 - 2⁶ = 71653357 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 (71653451) 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 7 ways as a sum of consecutive naturals, for example, 9611 + ... + 15351.

It is an arithmetic number, because the mean of its divisors is an integer number (10243728).

Almost surely, 2^71653421 is an apocalyptic number.

It is an amenable number.

71653421 is a deficient number, since it is larger than the sum of its proper divisors (10296403).

71653421 is a wasteful number, since it uses less digits than its factorization.

71653421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7531.

The product of its digits is 5040, while the sum is 29.

The square root of 71653421 is about 8464.8343752255. The cubic root of 71653421 is about 415.3481783109.

The spelling of 71653421 in words is "seventy-one million, six hundred fifty-three thousand, four hundred twenty-one".