12021211500 has 48 divisors (see below), whose sum is σ = 35005772256. Its totient is φ = 3205656000.

The previous prime is 12021211493. The next prime is 12021211507. The reversal of 12021211500 is 511212021.

It is an interprime number because it is at equal distance from previous prime (12021211493) and next prime (12021211507).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12021211500.

It is not an unprimeable number, because it can be changed into a prime (12021211507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4005571 + ... + 4008570.

It is an arithmetic number, because the mean of its divisors is an integer number (729286922).

Almost surely, 2^12021211500 is an apocalyptic number.

12021211500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021211500 is an abundant number, since it is smaller than the sum of its proper divisors (22984560756).

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

12021211500 is a wasteful number, since it uses less digits than its factorization.

12021211500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8014163 (or 8014151 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 12021211500 its reverse (511212021), we get a palindrome (12532423521).

The spelling of 12021211500 in words is "twelve billion, twenty-one million, two hundred eleven thousand, five hundred".