12101222172 has 24 divisors (see below), whose sum is σ = 30408199696. Its totient is φ = 3723452928.

The previous prime is 12101222171. The next prime is 12101222173. The reversal of 12101222172 is 27122210121.

It is an interprime number because it is at equal distance from previous prime (12101222171) and next prime (12101222173).

It is a super-2 number, since 2×12101222172² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101222171) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 38785813 + ... + 38786124.

Almost surely, 2^12101222172 is an apocalyptic number.

12101222172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12101222172 is an abundant number, since it is smaller than the sum of its proper divisors (18306977524).

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

12101222172 is a wasteful number, since it uses less digits than its factorization.

12101222172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77571957 (or 77571955 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

Adding to 12101222172 its reverse (27122210121), we get a palindrome (39223432293).

The spelling of 12101222172 in words is "twelve billion, one hundred one million, two hundred twenty-two thousand, one hundred seventy-two".