21234201043309 has 4 divisors (see below), whose sum is σ = 21352827864960. Its totient is φ = 21115574221660.

The previous prime is 21234201043277. The next prime is 21234201043333. The reversal of 21234201043309 is 90334010243212.

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 21234201043309 - 2⁵ = 21234201043277 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 (21234201040309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59313410557 + ... + 59313410914.

It is an arithmetic number, because the mean of its divisors is an integer number (5338206966240).

Almost surely, 2^{21234201043309} is an apocalyptic number.

It is an amenable number.

21234201043309 is a deficient number, since it is larger than the sum of its proper divisors (118626821651).

21234201043309 is a wasteful number, since it uses less digits than its factorization.

21234201043309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118626821650.

The product of its (nonzero) digits is 31104, while the sum is 34.

The spelling of 21234201043309 in words is "twenty-one trillion, two hundred thirty-four billion, two hundred one million, forty-three thousand, three hundred nine".