1304431400021 has 8 divisors (see below), whose sum is σ = 1307110226688. Its totient is φ = 1301754510000.

The previous prime is 1304431399963. The next prime is 1304431400039. The reversal of 1304431400021 is 1200041344031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1304431400021 is a prime.

It is a super-2 number, since 2×1304431400021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1304431400021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304431400081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868196 + ... + 1833746.

It is an arithmetic number, because the mean of its divisors is an integer number (163388778336).

Almost surely, 2^{1304431400021} is an apocalyptic number.

It is an amenable number.

1304431400021 is a deficient number, since it is larger than the sum of its proper divisors (2678826667).

1304431400021 is an equidigital number, since it uses as much as digits as its factorization.

1304431400021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968323.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 1304431400021 its reverse (1200041344031), we get a palindrome (2504472744052).

The spelling of 1304431400021 in words is "one trillion, three hundred four billion, four hundred thirty-one million, four hundred thousand, twenty-one".