97129221187 has 4 divisors (see below), whose sum is σ = 102241285480. Its totient is φ = 92017156896.

The previous prime is 97129221151. The next prime is 97129221197. The reversal of 97129221187 is 78112292179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78112292179 = 28439 ⋅2746661.

It is a cyclic number.

It is not a de Polignac number, because 97129221187 - 2¹¹ = 97129219139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 97129221187.

It is not an unprimeable number, because it can be changed into a prime (97129221197) 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, 2556032118 + ... + 2556032155.

It is an arithmetic number, because the mean of its divisors is an integer number (25560321370).

Almost surely, 2^97129221187 is an apocalyptic number.

97129221187 is a deficient number, since it is larger than the sum of its proper divisors (5112064293).

97129221187 is a wasteful number, since it uses less digits than its factorization.

97129221187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5112064292.

The product of its digits is 254016, while the sum is 49.

The spelling of 97129221187 in words is "ninety-seven billion, one hundred twenty-nine million, two hundred twenty-one thousand, one hundred eighty-seven".