12142155021 has 8 divisors (see below), whose sum is σ = 17141865984. Its totient is φ = 7618607040.

The previous prime is 12142155017. The next prime is 12142155037. The reversal of 12142155021 is 12055124121.

It is a happy number.

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

It is not a de Polignac number, because 12142155021 - 2² = 12142155017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12142154982 and 12142155000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12142155001) 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, 119040685 + ... + 119040786.

It is an arithmetic number, because the mean of its divisors is an integer number (2142733248).

Almost surely, 2^12142155021 is an apocalyptic number.

It is an amenable number.

12142155021 is a deficient number, since it is larger than the sum of its proper divisors (4999710963).

12142155021 is a wasteful number, since it uses less digits than its factorization.

12142155021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238081491.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 12142155021 its reverse (12055124121), we get a palindrome (24197279142).

The spelling of 12142155021 in words is "twelve billion, one hundred forty-two million, one hundred fifty-five thousand, twenty-one".