122171788381 has 8 divisors (see below), whose sum is σ = 127687545720. Its totient is φ = 116742893568.

The previous prime is 122171788369. The next prime is 122171788411. The reversal of 122171788381 is 183887171221.

It can be written as a sum of positive squares in 4 ways, for example, as 16178568025 + 105993220356 = 127195^2 + 325566^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122171788381 - 2¹³ = 122171780189 is a prime.

It is a super-2 number, since 2×122171788381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122171788351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21712756 + ... + 21718381.

It is an arithmetic number, because the mean of its divisors is an integer number (15960943215).

Almost surely, 2^122171788381 is an apocalyptic number.

It is an amenable number.

122171788381 is a deficient number, since it is larger than the sum of its proper divisors (5515757339).

122171788381 is an equidigital number, since it uses as much as digits as its factorization.

122171788381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43431263.

The product of its digits is 301056, while the sum is 49.

The spelling of 122171788381 in words is "one hundred twenty-two billion, one hundred seventy-one million, seven hundred eighty-eight thousand, three hundred eighty-one".