25221122000 has 80 divisors (see below), whose sum is σ = 61295197392. Its totient is φ = 10037081600.

The previous prime is 25221121963. The next prime is 25221122053. The reversal of 25221122000 is 22112252.

It can be written as a sum of positive squares in 8 ways, for example, as 254593936 + 24966528064 = 15956^2 + 158008^2 .

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

It is a super-2 number, since 2×25221122000² (a number of 22 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 25221122000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361994 + ... + 426006.

Almost surely, 2^25221122000 is an apocalyptic number.

25221122000 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 25221122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30647598696).

25221122000 is an abundant number, since it is smaller than the sum of its proper divisors (36074075392).

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

25221122000 is a wasteful number, since it uses less digits than its factorization.

25221122000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64233 (or 64217 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 25221122000 its reverse (22112252), we get a palindrome (25243234252).

The spelling of 25221122000 in words is "twenty-five billion, two hundred twenty-one million, one hundred twenty-two thousand".