73657221121 has 16 divisors (see below), whose sum is σ = 87824521728. Its totient is φ = 60989241600.

The previous prime is 73657221119. The next prime is 73657221163. The reversal of 73657221121 is 12112275637.

It is a 6-Lehmer number, since φ(73657221121) divides (73657221121-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 73657221121 - 2¹ = 73657221119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73657281121) 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, 6347250 + ... + 6358843.

It is an arithmetic number, because the mean of its divisors is an integer number (5489032608).

It is a Proth number, since it is equal to 70245 ⋅ 2²⁰ + 1 and 70245 < 2²⁰.

Almost surely, 2^73657221121 is an apocalyptic number.

It is an amenable number.

73657221121 is a deficient number, since it is larger than the sum of its proper divisors (14167300607).

73657221121 is a wasteful number, since it uses less digits than its factorization.

73657221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12706152.

The product of its digits is 35280, while the sum is 37.

Adding to 73657221121 its reverse (12112275637), we get a palindrome (85769496758).

The spelling of 73657221121 in words is "seventy-three billion, six hundred fifty-seven million, two hundred twenty-one thousand, one hundred twenty-one".