25140320121 has 16 divisors (see below), whose sum is σ = 38468025728. Its totient is φ = 14306284800.

The previous prime is 25140320119. The next prime is 25140320189. The reversal of 25140320121 is 12102304152.

It is not a de Polignac number, because 25140320121 - 2¹ = 25140320119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25140320111) 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 15 ways as a sum of consecutive naturals, for example, 2478670 + ... + 2488791.

It is an arithmetic number, because the mean of its divisors is an integer number (2404251608).

Almost surely, 2^25140320121 is an apocalyptic number.

25140320121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25140320121 is a deficient number, since it is larger than the sum of its proper divisors (13327705607).

25140320121 is a wasteful number, since it uses less digits than its factorization.

25140320121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4967712.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 25140320121 its reverse (12102304152), we get a palindrome (37242624273).

The spelling of 25140320121 in words is "twenty-five billion, one hundred forty million, three hundred twenty thousand, one hundred twenty-one".