25116421000 has 128 divisors (see below), whose sum is σ = 64354642560. Its totient is φ = 9099168000.

The previous prime is 25116420997. The next prime is 25116421003. The reversal of 25116421000 is 12461152.

It is an interprime number because it is at equal distance from previous prime (25116420997) and next prime (25116421003).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (25116421003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3042879 + ... + 3051121.

It is an arithmetic number, because the mean of its divisors is an integer number (502770645).

Almost surely, 2^25116421000 is an apocalyptic number.

25116421000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25116421000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32177321280).

25116421000 is an abundant number, since it is smaller than the sum of its proper divisors (39238221560).

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

25116421000 is a wasteful number, since it uses less digits than its factorization.

25116421000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8552 (or 8538 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 25116421000 its reverse (12461152), we get a palindrome (25128882152).

The spelling of 25116421000 in words is "twenty-five billion, one hundred sixteen million, four hundred twenty-one thousand".