1321253224320 has 128 divisors (see below), whose sum is σ = 4241794032000. Its totient is φ = 349799344128.

The previous prime is 1321253224297. The next prime is 1321253224331. The reversal of 1321253224320 is 234223521231.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 2208490 + ... + 2742249.

It is an arithmetic number, because the mean of its divisors is an integer number (33139015875).

Almost surely, 2^{1321253224320} is an apocalyptic number.

1321253224320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321253224320 is an abundant number, since it is smaller than the sum of its proper divisors (2920540807680).

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

1321253224320 is a wasteful number, since it uses less digits than its factorization.

1321253224320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4950900 (or 4950888 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 1321253224320 its reverse (234223521231), we get a palindrome (1555476745551).

The spelling of 1321253224320 in words is "one trillion, three hundred twenty-one billion, two hundred fifty-three million, two hundred twenty-four thousand, three hundred twenty".