122811171378 has 128 divisors (see below), whose sum is σ = 299469312000. Its totient is φ = 32795642880.

The previous prime is 122811171377. The next prime is 122811171451. The reversal of 122811171378 is 873171118221.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (122811171377) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 37000803 + ... + 37004121.

It is an arithmetic number, because the mean of its divisors is an integer number (2339604000).

Almost surely, 2^122811171378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 122811171378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149734656000).

122811171378 is an abundant number, since it is smaller than the sum of its proper divisors (176658140622).

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

122811171378 is a wasteful number, since it uses less digits than its factorization.

122811171378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960.

The product of its digits is 37632, while the sum is 42.

Adding to 122811171378 its reverse (873171118221), we get a palindrome (995982289599).

The spelling of 122811171378 in words is "one hundred twenty-two billion, eight hundred eleven million, one hundred seventy-one thousand, three hundred seventy-eight".