12121011152 has 80 divisors (see below), whose sum is σ = 25602557760. Its totient is φ = 5535811584.

The previous prime is 12121011143. The next prime is 12121011167. The reversal of 12121011152 is 25111012121.

It is a super-2 number, since 2×12121011152² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 12121011152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4698599 + ... + 4701177.

It is an arithmetic number, because the mean of its divisors is an integer number (320031972).

Almost surely, 2^12121011152 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 12121011152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12801278880).

12121011152 is an abundant number, since it is smaller than the sum of its proper divisors (13481546608).

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

12121011152 is a wasteful number, since it uses less digits than its factorization.

12121011152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3108 (or 3102 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 12121011152 its reverse (25111012121), we get a palindrome (37232023273).

The spelling of 12121011152 in words is "twelve billion, one hundred twenty-one million, eleven thousand, one hundred fifty-two".