12021384157 has 16 divisors (see below), whose sum is σ = 12538437120. Its totient is φ = 11516274432.

The previous prime is 12021384127. The next prime is 12021384187. The reversal of 12021384157 is 75148312021.

It is an interprime number because it is at equal distance from previous prime (12021384127) and next prime (12021384187).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021384157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021384127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1088053 + ... + 1099045.

It is an arithmetic number, because the mean of its divisors is an integer number (783652320).

Almost surely, 2^12021384157 is an apocalyptic number.

It is an amenable number.

12021384157 is a deficient number, since it is larger than the sum of its proper divisors (517052963).

12021384157 is a wasteful number, since it uses less digits than its factorization.

12021384157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11532.

The product of its (nonzero) digits is 13440, while the sum is 34.

Adding to 12021384157 its reverse (75148312021), we get a palindrome (87169696178).

The spelling of 12021384157 in words is "twelve billion, twenty-one million, three hundred eighty-four thousand, one hundred fifty-seven".