1321324401040 has 80 divisors (see below), whose sum is σ = 3521366439552. Its totient is φ = 451681155072.

The previous prime is 1321324401037. The next prime is 1321324401041. The reversal of 1321324401040 is 401044231231.

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

It is a junction number, because it is equal to n+sod(n) for n = 1321324400996 and 1321324401014.

It is not an unprimeable number, because it can be changed into a prime (1321324401041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3312034 + ... + 3689473.

Almost surely, 2^{1321324401040} is an apocalyptic number.

1321324401040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321324401040 is an abundant number, since it is smaller than the sum of its proper divisors (2200042038512).

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

1321324401040 is a wasteful number, since it uses less digits than its factorization.

1321324401040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001864 (or 7001858 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 1321324401040 its reverse (401044231231), we get a palindrome (1722368632271).

The spelling of 1321324401040 in words is "one trillion, three hundred twenty-one billion, three hundred twenty-four million, four hundred one thousand, forty".