25821321120 has 576 divisors, whose sum is σ = 105631029504. Its totient is φ = 5620285440.

The previous prime is 25821321101. The next prime is 25821321121. The reversal of 25821321120 is 2112312852.

It is not an unprimeable number, because it can be changed into a prime (25821321121) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17770314 + ... + 17771766.

It is an arithmetic number, because the mean of its divisors is an integer number (183387204).

Almost surely, 2^25821321120 is an apocalyptic number.

25821321120 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 25821321120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52815514752).

25821321120 is an abundant number, since it is smaller than the sum of its proper divisors (79809708384).

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

25821321120 is a wasteful number, since it uses less digits than its factorization.

25821321120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565 (or 1554 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 25821321120 its reverse (2112312852), we get a palindrome (27933633972).

The spelling of 25821321120 in words is "twenty-five billion, eight hundred twenty-one million, three hundred twenty-one thousand, one hundred twenty".