25541109921 has 8 divisors (see below), whose sum is σ = 34177755904. Its totient is φ = 16965935280.

The previous prime is 25541109889. The next prime is 25541109929. The reversal of 25541109921 is 12990114552.

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 25541109921 - 2⁵ = 25541109889 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 25541109921.

It is not an unprimeable number, because it can be changed into a prime (25541109929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15366865 + ... + 15368526.

It is an arithmetic number, because the mean of its divisors is an integer number (4272219488).

Almost surely, 2^25541109921 is an apocalyptic number.

It is an amenable number.

25541109921 is a deficient number, since it is larger than the sum of its proper divisors (8636645983).

25541109921 is a wasteful number, since it uses less digits than its factorization.

25541109921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30735671.

The product of its (nonzero) digits is 32400, while the sum is 39.

The spelling of 25541109921 in words is "twenty-five billion, five hundred forty-one million, one hundred nine thousand, nine hundred twenty-one".