25121223120 has 80 divisors (see below), whose sum is σ = 89000910720. Its totient is φ = 5741993472.

The previous prime is 25121223109. The next prime is 25121223151. The reversal of 25121223120 is 2132212152.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7474875 + ... + 7478234.

It is an arithmetic number, because the mean of its divisors is an integer number (1112511384).

Almost surely, 2^25121223120 is an apocalyptic number.

25121223120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25121223120 is an abundant number, since it is smaller than the sum of its proper divisors (63879687600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25121223120 is a wasteful number, since it uses less digits than its factorization.

25121223120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14953132 (or 14953126 counting only the distinct ones).

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

Adding to 25121223120 its reverse (2132212152), we get a palindrome (27253435272).

The spelling of 25121223120 in words is "twenty-five billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred twenty".