1231431120213 has 16 divisors (see below), whose sum is σ = 1936997646336. Its totient is φ = 680975734320.

The previous prime is 1231431120197. The next prime is 1231431120299. The reversal of 1231431120213 is 3120211341321.

It is not a de Polignac number, because 1231431120213 - 2⁴ = 1231431120197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231431120013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 945798981 + ... + 945800282.

It is an arithmetic number, because the mean of its divisors is an integer number (121062352896).

Almost surely, 2^{1231431120213} is an apocalyptic number.

It is an amenable number.

1231431120213 is a deficient number, since it is larger than the sum of its proper divisors (705566526123).

1231431120213 is a wasteful number, since it uses less digits than its factorization.

1231431120213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1891599304.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 1231431120213 its reverse (3120211341321), we get a palindrome (4351642461534).

The spelling of 1231431120213 in words is "one trillion, two hundred thirty-one billion, four hundred thirty-one million, one hundred twenty thousand, two hundred thirteen".