1231431441021 has 12 divisors (see below), whose sum is σ = 1782298908000. Its totient is φ = 819309092040.

The previous prime is 1231431440947. The next prime is 1231431441059. The reversal of 1231431441021 is 1201441341321.

It is a happy number.

1231431441021 is a `hidden beast` number, since 1 + 2 + 314 + 314 + 4 + 10 + 21 = 666.

It is not a de Polignac number, because 1231431441021 - 2⁷ = 1231431440893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231431440021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137095425 + ... + 137104406.

It is an arithmetic number, because the mean of its divisors is an integer number (148524909000).

Almost surely, 2^{1231431441021} is an apocalyptic number.

It is an amenable number.

1231431441021 is a deficient number, since it is larger than the sum of its proper divisors (550867466979).

1231431441021 is a wasteful number, since it uses less digits than its factorization.

1231431441021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274200336 (or 274200333 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 1231431441021 its reverse (1201441341321), we get a palindrome (2432872782342).

The spelling of 1231431441021 in words is "one trillion, two hundred thirty-one billion, four hundred thirty-one million, four hundred forty-one thousand, twenty-one".