12155222310520 has 32 divisors (see below), whose sum is σ = 27458211377520. Its totient is φ = 4842718048000.

The previous prime is 12155222310457. The next prime is 12155222310577. The reversal of 12155222310520 is 2501322255121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605329717 + ... + 605349796.

Almost surely, 2^{12155222310520} is an apocalyptic number.

12155222310520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12155222310520 is an abundant number, since it is smaller than the sum of its proper divisors (15302989067000).

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

12155222310520 is a wasteful number, since it uses less digits than its factorization.

12155222310520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210679775 (or 1210679771 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 12155222310520 its reverse (2501322255121), we get a palindrome (14656544565641).

The spelling of 12155222310520 in words is "twelve trillion, one hundred fifty-five billion, two hundred twenty-two million, three hundred ten thousand, five hundred twenty".