12002121000 has 128 divisors (see below), whose sum is σ = 41607446400. Its totient is φ = 3200558400.

The previous prime is 12002120993. The next prime is 12002121011. The reversal of 12002121000 is 12120021.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195262 + ... + 249261.

It is an arithmetic number, because the mean of its divisors is an integer number (325058175).

Almost surely, 2^12002121000 is an apocalyptic number.

12002121000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12002121000 is an abundant number, since it is smaller than the sum of its proper divisors (29605325400).

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

12002121000 is a wasteful number, since it uses less digits than its factorization.

12002121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444553 (or 444533 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12002121000 its reverse (12120021), we get a palindrome (12014241021).

The spelling of 12002121000 in words is "twelve billion, two million, one hundred twenty-one thousand".