21023021303309 has 4 divisors (see below), whose sum is σ = 21023252003616. Its totient is φ = 21022790603004.

The previous prime is 21023021303279. The next prime is 21023021303357. The reversal of 21023021303309 is 90330312032012.

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 21023021303309 - 2¹² = 21023021299213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023021303909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115213409 + ... + 115395734.

It is an arithmetic number, because the mean of its divisors is an integer number (5255813000904).

Almost surely, 2^{21023021303309} is an apocalyptic number.

It is an amenable number.

21023021303309 is a deficient number, since it is larger than the sum of its proper divisors (230700307).

21023021303309 is an equidigital number, since it uses as much as digits as its factorization.

21023021303309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230700306.

The product of its (nonzero) digits is 5832, while the sum is 29.

The spelling of 21023021303309 in words is "twenty-one trillion, twenty-three billion, twenty-one million, three hundred three thousand, three hundred nine".