12021351655 has 8 divisors (see below), whose sum is σ = 14429004912. Its totient is φ = 9614826048.

The previous prime is 12021351637. The next prime is 12021351677. The reversal of 12021351655 is 55615312021.

12021351655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12021351655 - 2¹⁷ = 12021220583 is a prime.

It is a super-2 number, since 2×12021351655² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258277 + ... + 301246.

It is an arithmetic number, because the mean of its divisors is an integer number (1803625614).

Almost surely, 2^12021351655 is an apocalyptic number.

12021351655 is a deficient number, since it is larger than the sum of its proper divisors (2407653257).

12021351655 is an equidigital number, since it uses as much as digits as its factorization.

12021351655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563825.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 12021351655 its reverse (55615312021), we get a palindrome (67636663676).

The spelling of 12021351655 in words is "twelve billion, twenty-one million, three hundred fifty-one thousand, six hundred fifty-five".