25121001020 has 24 divisors (see below), whose sum is σ = 52920532224. Its totient is φ = 10016699456.

The previous prime is 25121001019. The next prime is 25121001089. The reversal of 25121001020 is 2010012152.

It is a junction number, because it is equal to n+sod(n) for n = 25121000986 and 25121001004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1974812 + ... + 1987491.

It is an arithmetic number, because the mean of its divisors is an integer number (2205022176).

Almost surely, 2^25121001020 is an apocalyptic number.

25121001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25121001020 is an abundant number, since it is smaller than the sum of its proper divisors (27799531204).

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

25121001020 is a wasteful number, since it uses less digits than its factorization.

25121001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3962629 (or 3962627 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

Adding to 25121001020 its reverse (2010012152), we get a palindrome (27131013172).

The spelling of 25121001020 in words is "twenty-five billion, one hundred twenty-one million, one thousand, twenty".