71655101221 has 8 divisors (see below), whose sum is σ = 78496272000. Its totient is φ = 64868442240.

The previous prime is 71655101213. The next prime is 71655101227. The reversal of 71655101221 is 12210155617.

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

It is a cyclic number.

It is not a de Polignac number, because 71655101221 - 2³ = 71655101213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71655101227) 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, 13625196 + ... + 13630453.

It is an arithmetic number, because the mean of its divisors is an integer number (9812034000).

Almost surely, 2^71655101221 is an apocalyptic number.

It is an amenable number.

71655101221 is a deficient number, since it is larger than the sum of its proper divisors (6841170779).

71655101221 is a wasteful number, since it uses less digits than its factorization.

71655101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27255899.

The product of its (nonzero) digits is 4200, while the sum is 31.

Adding to 71655101221 its reverse (12210155617), we get a palindrome (83865256838).

The spelling of 71655101221 in words is "seventy-one billion, six hundred fifty-five million, one hundred one thousand, two hundred twenty-one".