72122121151 has 4 divisors (see below), whose sum is σ = 72140794992. Its totient is φ = 72103447312.

The previous prime is 72122121119. The next prime is 72122121157. The reversal of 72122121151 is 15112122127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72122121151 - 2⁵ = 72122121119 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 (72122121157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9331126 + ... + 9338851.

It is an arithmetic number, because the mean of its divisors is an integer number (18035198748).

Almost surely, 2^72122121151 is an apocalyptic number.

72122121151 is a deficient number, since it is larger than the sum of its proper divisors (18673841).

72122121151 is a wasteful number, since it uses less digits than its factorization.

72122121151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18673840.

The product of its digits is 560, while the sum is 25.

Adding to 72122121151 its reverse (15112122127), we get a palindrome (87234243278).

The spelling of 72122121151 in words is "seventy-two billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred fifty-one".