12021211987 has 8 divisors (see below), whose sum is σ = 12166368192. Its totient is φ = 11876865000.

The previous prime is 12021211963. The next prime is 12021212003. The reversal of 12021211987 is 78911212021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12021211987 - 2²³ = 12012823379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021211927) 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, 172389 + ... + 231862.

It is an arithmetic number, because the mean of its divisors is an integer number (1520796024).

Almost surely, 2^12021211987 is an apocalyptic number.

12021211987 is a deficient number, since it is larger than the sum of its proper divisors (145156205).

12021211987 is a wasteful number, since it uses less digits than its factorization.

12021211987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404609.

The product of its (nonzero) digits is 4032, while the sum is 34.

Adding to 12021211987 its sum of digits (34), we get a palindrome (12021212021).

The spelling of 12021211987 in words is "twelve billion, twenty-one million, two hundred eleven thousand, nine hundred eighty-seven".