1242156831412 has 24 divisors (see below), whose sum is σ = 2484554945600. Its totient is φ = 532301224320.

The previous prime is 1242156831379. The next prime is 1242156831413. The reversal of 1242156831412 is 2141386512421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242156831413) 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, 1860162 + ... + 2438137.

Almost surely, 2^{1242156831412} is an apocalyptic number.

It is an amenable number.

1242156831412 is an abundant number, since it is smaller than the sum of its proper divisors (1242398114188).

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

1242156831412 is a wasteful number, since it uses less digits than its factorization.

1242156831412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4308631 (or 4308629 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The spelling of 1242156831412 in words is "one trillion, two hundred forty-two billion, one hundred fifty-six million, eight hundred thirty-one thousand, four hundred twelve".