79121100000 has 144 divisors (see below), whose sum is σ = 259600478256. Its totient is φ = 21098880000.

The previous prime is 79121099989. The next prime is 79121100011. The reversal of 79121100000 is 112197.

It is an interprime number because it is at equal distance from previous prime (79121099989) and next prime (79121100011).

It is a self number, because there is not a number n which added to its sum of digits gives 79121100000.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 168132 + ... + 431868.

It is an arithmetic number, because the mean of its divisors is an integer number (1802781099).

Almost surely, 2^79121100000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79121100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129800239128).

79121100000 is an abundant number, since it is smaller than the sum of its proper divisors (180479378256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79121100000 is an equidigital number, since it uses as much as digits as its factorization.

79121100000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263775 (or 263747 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 21.

Adding to 79121100000 its reverse (112197), we get a palindrome (79121212197).

The spelling of 79121100000 in words is "seventy-nine billion, one hundred twenty-one million, one hundred thousand".