1221431525000 has 96 divisors (see below), whose sum is σ = 2876125916160. Its totient is φ = 486255000000.

The previous prime is 1221431524997. The next prime is 1221431525009. The reversal of 1221431525000 is 5251341221.

It is not an unprimeable number, because it can be changed into a prime (1221431525009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5159225 + ... + 5390775.

It is an arithmetic number, because the mean of its divisors is an integer number (29959644960).

Almost surely, 2^{1221431525000} is an apocalyptic number.

1221431525000 is a gapful number since it is divisible by the number (10) 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 1221431525000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1438062958080).

1221431525000 is an abundant number, since it is smaller than the sum of its proper divisors (1654694391160).

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

1221431525000 is an equidigital number, since it uses as much as digits as its factorization.

1221431525000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231793 (or 231769 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 1221431525000 its reverse (5251341221), we get a palindrome (1226682866221).

The spelling of 1221431525000 in words is "one trillion, two hundred twenty-one billion, four hundred thirty-one million, five hundred twenty-five thousand".