1231421423541 has 16 divisors (see below), whose sum is σ = 1650187484160. Its totient is φ = 816806370240.

The previous prime is 1231421423497. The next prime is 1231421423563. The reversal of 1231421423541 is 1453241241321.

It is not a de Polignac number, because 1231421423541 - 2¹⁴ = 1231421407157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231421423941) 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, 401311 + ... + 1619843.

It is an arithmetic number, because the mean of its divisors is an integer number (103136717760).

Almost surely, 2^{1231421423541} is an apocalyptic number.

It is an amenable number.

1231421423541 is a deficient number, since it is larger than the sum of its proper divisors (418766060619).

1231421423541 is a wasteful number, since it uses less digits than its factorization.

1231421423541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220236.

The product of its digits is 23040, while the sum is 33.

Adding to 1231421423541 its reverse (1453241241321), we get a palindrome (2684662664862).

The spelling of 1231421423541 in words is "one trillion, two hundred thirty-one billion, four hundred twenty-one million, four hundred twenty-three thousand, five hundred forty-one".