1321001420421 has 16 divisors (see below), whose sum is σ = 1781444292480. Its totient is φ = 870616623360.

The previous prime is 1321001420363. The next prime is 1321001420423. The reversal of 1321001420421 is 1240241001231.

It is not a de Polignac number, because 1321001420421 - 2²¹ = 1320999323269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321001420423) 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 15 ways as a sum of consecutive naturals, for example, 1061401 + ... + 1941281.

It is an arithmetic number, because the mean of its divisors is an integer number (111340268280).

Almost surely, 2^{1321001420421} is an apocalyptic number.

It is an amenable number.

1321001420421 is a deficient number, since it is larger than the sum of its proper divisors (460442872059).

1321001420421 is an equidigital number, since it uses as much as digits as its factorization.

1321001420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885596.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1321001420421 its reverse (1240241001231), we get a palindrome (2561242421652).

The spelling of 1321001420421 in words is "one trillion, three hundred twenty-one billion, one million, four hundred twenty thousand, four hundred twenty-one".