1231021154144 has 48 divisors (see below), whose sum is σ = 2442681077760. Its totient is φ = 610663777920.

The previous prime is 1231021154107. The next prime is 1231021154179. The reversal of 1231021154144 is 4414511201321.

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, 6448937 + ... + 6637079.

It is an arithmetic number, because the mean of its divisors is an integer number (50889189120).

Almost surely, 2^{1231021154144} is an apocalyptic number.

It is an amenable number.

1231021154144 is a deficient number, since it is larger than the sum of its proper divisors (1211659923616).

1231021154144 is a wasteful number, since it uses less digits than its factorization.

1231021154144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189763 (or 189755 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

Adding to 1231021154144 its reverse (4414511201321), we get a palindrome (5645532355465).

The spelling of 1231021154144 in words is "one trillion, two hundred thirty-one billion, twenty-one million, one hundred fifty-four thousand, one hundred forty-four".