25531321121405 has 32 divisors (see below), whose sum is σ = 34371211593600. Its totient is φ = 18048421811200.

The previous prime is 25531321121377. The next prime is 25531321121417. The reversal of 25531321121405 is 50412112313552.

It is not a de Polignac number, because 25531321121405 - 2¹⁰ = 25531321120381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43912856 + ... + 44490465.

It is an arithmetic number, because the mean of its divisors is an integer number (1074100362300).

Almost surely, 2^{25531321121405} is an apocalyptic number.

It is an amenable number.

25531321121405 is a deficient number, since it is larger than the sum of its proper divisors (8839890472195).

25531321121405 is a wasteful number, since it uses less digits than its factorization.

25531321121405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88403485.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 25531321121405 its reverse (50412112313552), we get a palindrome (75943433434957).

The spelling of 25531321121405 in words is "twenty-five trillion, five hundred thirty-one billion, three hundred twenty-one million, one hundred twenty-one thousand, four hundred five".