1321022002451 has 8 divisors (see below), whose sum is σ = 1378693234464. Its totient is φ = 1263370394880.

The previous prime is 1321022002423. The next prime is 1321022002501. The reversal of 1321022002451 is 1542002201231.

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-1321022002451 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321022022451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4768460 + ... + 5037881.

It is an arithmetic number, because the mean of its divisors is an integer number (172336654308).

Almost surely, 2^{1321022002451} is an apocalyptic number.

1321022002451 is a deficient number, since it is larger than the sum of its proper divisors (57671232013).

1321022002451 is an equidigital number, since it uses as much as digits as its factorization.

1321022002451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9812221.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 1321022002451 its reverse (1542002201231), we get a palindrome (2863024203682).

The spelling of 1321022002451 in words is "one trillion, three hundred twenty-one billion, twenty-two million, two thousand, four hundred fifty-one".