21834225106509 has 4 divisors (see below), whose sum is σ = 29112300142016. Its totient is φ = 14556150071004.

The previous prime is 21834225106501. The next prime is 21834225106559. The reversal of 21834225106509 is 90560152243812.

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 not a de Polignac number, because 21834225106509 - 2³ = 21834225106501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21834225106501) 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, 3639037517749 + ... + 3639037517754.

It is an arithmetic number, because the mean of its divisors is an integer number (7278075035504).

Almost surely, 2^{21834225106509} is an apocalyptic number.

It is an amenable number.

21834225106509 is a deficient number, since it is larger than the sum of its proper divisors (7278075035507).

21834225106509 is an equidigital number, since it uses as much as digits as its factorization.

21834225106509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7278075035506.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The spelling of 21834225106509 in words is "twenty-one trillion, eight hundred thirty-four billion, two hundred twenty-five million, one hundred six thousand, five hundred nine".