72120311101 has 4 divisors (see below), whose sum is σ = 72639162400. Its totient is φ = 71601459804.

The previous prime is 72120311099. The next prime is 72120311161. The reversal of 72120311101 is 10111302127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72120311101 - 2¹ = 72120311099 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 (72120311161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259425441 + ... + 259425718.

It is an arithmetic number, because the mean of its divisors is an integer number (18159790600).

Almost surely, 2^72120311101 is an apocalyptic number.

It is an amenable number.

72120311101 is a deficient number, since it is larger than the sum of its proper divisors (518851299).

72120311101 is a wasteful number, since it uses less digits than its factorization.

72120311101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518851298.

The product of its (nonzero) digits is 84, while the sum is 19.

Adding to 72120311101 its reverse (10111302127), we get a palindrome (82231613228).

The spelling of 72120311101 in words is "seventy-two billion, one hundred twenty million, three hundred eleven thousand, one hundred one".