12155222310542 has 4 divisors (see below), whose sum is σ = 18232833465816. Its totient is φ = 6077611155270.

The previous prime is 12155222310457. The next prime is 12155222310577. The reversal of 12155222310542 is 24501322255121.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3038805577634 + ... + 3038805577637.

It is an arithmetic number, because the mean of its divisors is an integer number (4558208366454).

Almost surely, 2^{12155222310542} is an apocalyptic number.

12155222310542 is a deficient number, since it is larger than the sum of its proper divisors (6077611155274).

12155222310542 is an equidigital number, since it uses as much as digits as its factorization.

12155222310542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6077611155273.

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 12155222310542 its reverse (24501322255121), we get a palindrome (36656544565663).

The spelling of 12155222310542 in words is "twelve trillion, one hundred fifty-five billion, two hundred twenty-two million, three hundred ten thousand, five hundred forty-two".