1231340211421 has 4 divisors (see below), whose sum is σ = 1232473000192. Its totient is φ = 1230207422652.

The previous prime is 1231340211371. The next prime is 1231340211427. The reversal of 1231340211421 is 1241120431321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1231340211421 - 2⁷ = 1231340211293 is a prime.

It is a super-3 number, since 3×1231340211421³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231340211427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566392755 + ... + 566394928.

It is an arithmetic number, because the mean of its divisors is an integer number (308118250048).

Almost surely, 2^{1231340211421} is an apocalyptic number.

It is an amenable number.

1231340211421 is a deficient number, since it is larger than the sum of its proper divisors (1132788771).

1231340211421 is a wasteful number, since it uses less digits than its factorization.

1231340211421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132788770.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 1231340211421 its reverse (1241120431321), we get a palindrome (2472460642742).

The spelling of 1231340211421 in words is "one trillion, two hundred thirty-one billion, three hundred forty million, two hundred eleven thousand, four hundred twenty-one".