21303500401409 has 4 divisors (see below), whose sum is σ = 21347244755904. Its totient is φ = 21259756046916.

The previous prime is 21303500401387. The next prime is 21303500401411. The reversal of 21303500401409 is 90410400530312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21303500401409 - 2⁸ = 21303500401153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303500401489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21872176517 + ... + 21872177490.

It is an arithmetic number, because the mean of its divisors is an integer number (5336811188976).

Almost surely, 2^{21303500401409} is an apocalyptic number.

It is an amenable number.

21303500401409 is a deficient number, since it is larger than the sum of its proper divisors (43744354495).

21303500401409 is an equidigital number, since it uses as much as digits as its factorization.

21303500401409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43744354494.

The product of its (nonzero) digits is 12960, while the sum is 32.

The spelling of 21303500401409 in words is "twenty-one trillion, three hundred three billion, five hundred million, four hundred one thousand, four hundred nine".