25221255000 has 160 divisors (see below), whose sum is σ = 78917675760. Its totient is φ = 6714880000.

The previous prime is 25221254951. The next prime is 25221255023. The reversal of 25221255000 is 55212252.

It is a super-2 number, since 2×25221255000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14654140 + ... + 14655860.

Almost surely, 2^25221255000 is an apocalyptic number.

25221255000 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 25221255000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39458837880).

25221255000 is an abundant number, since it is smaller than the sum of its proper divisors (53696420760).

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

25221255000 is a wasteful number, since it uses less digits than its factorization.

25221255000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2727 (or 2708 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

Adding to 25221255000 its reverse (55212252), we get a palindrome (25276467252).

The spelling of 25221255000 in words is "twenty-five billion, two hundred twenty-one million, two hundred fifty-five thousand".