1321251254541 has 48 divisors (see below), whose sum is σ = 1977507717120. Its totient is φ = 849192533280.

The previous prime is 1321251254507. The next prime is 1321251254563. The reversal of 1321251254541 is 1454521521231.

1321251254541 is a `hidden beast` number, since 1 + 3 + 2 + 12 + 51 + 2 + 54 + 541 = 666.

It is not a de Polignac number, because 1321251254541 - 2⁷ = 1321251254413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1321251254496 and 1321251254505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321251254501) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 118396720 + ... + 118407878.

It is an arithmetic number, because the mean of its divisors is an integer number (41198077440).

Almost surely, 2^{1321251254541} is an apocalyptic number.

It is an amenable number.

1321251254541 is a deficient number, since it is larger than the sum of its proper divisors (656256462579).

1321251254541 is a wasteful number, since it uses less digits than its factorization.

1321251254541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12766 (or 12763 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

Adding to 1321251254541 its reverse (1454521521231), we get a palindrome (2775772775772).

The spelling of 1321251254541 in words is "one trillion, three hundred twenty-one billion, two hundred fifty-one million, two hundred fifty-four thousand, five hundred forty-one".