12155536421 has 8 divisors (see below), whose sum is σ = 13901497344. Its totient is φ = 10411939440.

The previous prime is 12155536397. The next prime is 12155536433. The reversal of 12155536421 is 12463555121.

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

It is a de Polignac number, because none of the positive numbers 2^k-12155536421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155536321) 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, 579950 + ... + 600543.

It is an arithmetic number, because the mean of its divisors is an integer number (1737687168).

Almost surely, 2^12155536421 is an apocalyptic number.

It is an amenable number.

12155536421 is a deficient number, since it is larger than the sum of its proper divisors (1745960923).

12155536421 is a wasteful number, since it uses less digits than its factorization.

12155536421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181971.

The product of its digits is 36000, while the sum is 35.

The spelling of 12155536421 in words is "twelve billion, one hundred fifty-five million, five hundred thirty-six thousand, four hundred twenty-one".