1222211324400 has 480 divisors, whose sum is σ = 4465135784448. Its totient is φ = 282879590400.

The previous prime is 1222211324387. The next prime is 1222211324401. The reversal of 1222211324400 is 44231122221.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222211324401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 175173712 + ... + 175180688.

Almost surely, 2^{1222211324400} is an apocalyptic number.

1222211324400 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 1222211324400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2232567892224).

1222211324400 is an abundant number, since it is smaller than the sum of its proper divisors (3242924460048).

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

1222211324400 is a wasteful number, since it uses less digits than its factorization.

1222211324400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7609 (or 7598 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 1222211324400 its reverse (44231122221), we get a palindrome (1266442446621).

The spelling of 1222211324400 in words is "one trillion, two hundred twenty-two billion, two hundred eleven million, three hundred twenty-four thousand, four hundred".