25534120001221 has 8 divisors (see below), whose sum is σ = 27662943458304. Its totient is φ = 23428819455600.

The previous prime is 25534120001213. The next prime is 25534120001227. The reversal of 25534120001221 is 12210002143552.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25534120001221 - 2³ = 25534120001213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25534120001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25534120001227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5880725605 + ... + 5880729946.

It is an arithmetic number, because the mean of its divisors is an integer number (3457867932288).

Almost surely, 2^{25534120001221} is an apocalyptic number.

It is an amenable number.

25534120001221 is a deficient number, since it is larger than the sum of its proper divisors (2128823457083).

25534120001221 is a wasteful number, since it uses less digits than its factorization.

25534120001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11761455731.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 25534120001221 its reverse (12210002143552), we get a palindrome (37744122144773).

The spelling of 25534120001221 in words is "twenty-five trillion, five hundred thirty-four billion, one hundred twenty million, one thousand, two hundred twenty-one".