25122161521000 has 128 divisors (see below), whose sum is σ = 58874291424000. Its totient is φ = 10033759008000.

The previous prime is 25122161520979. The next prime is 25122161521001. The reversal of 25122161521000 is 12516122152.

It is a super-2 number, since 2×25122161521000² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25122161521000.

It is not an unprimeable number, because it can be changed into a prime (25122161521001) 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, 2339333631 + ... + 2339344369.

It is an arithmetic number, because the mean of its divisors is an integer number (459955401750).

Almost surely, 2^{25122161521000} is an apocalyptic number.

25122161521000 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 25122161521000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29437145712000).

25122161521000 is an abundant number, since it is smaller than the sum of its proper divisors (33752129903000).

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

25122161521000 is a wasteful number, since it uses less digits than its factorization.

25122161521000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14060 (or 14046 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

Adding to 25122161521000 its reverse (12516122152), we get a palindrome (25134677643152).

The spelling of 25122161521000 in words is "twenty-five trillion, one hundred twenty-two billion, one hundred sixty-one million, five hundred twenty-one thousand".