12021172152 has 32 divisors (see below), whose sum is σ = 32785015680. Its totient is φ = 3642779360.

The previous prime is 12021172139. The next prime is 12021172153. The reversal of 12021172152 is 25127112021.

It is a happy number.

It is a super-2 number, since 2×12021172152² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021172153) 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, 22767108 + ... + 22767635.

It is an arithmetic number, because the mean of its divisors is an integer number (1024531740).

Almost surely, 2^12021172152 is an apocalyptic number.

12021172152 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12021172152 is an abundant number, since it is smaller than the sum of its proper divisors (20763843528).

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

12021172152 is a wasteful number, since it uses less digits than its factorization.

12021172152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45534763 (or 45534759 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 24.

Adding to 12021172152 its reverse (25127112021), we get a palindrome (37148284173).

The spelling of 12021172152 in words is "twelve billion, twenty-one million, one hundred seventy-two thousand, one hundred fifty-two".