21895306013 has 8 divisors (see below), whose sum is σ = 26340217920. Its totient is φ = 17779646880.

The previous prime is 21895305997. The next prime is 21895306033. The reversal of 21895306013 is 31060359812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21895306013 - 2⁴ = 21895305997 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 (21895306033) 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 7 ways as a sum of consecutive naturals, for example, 82313048 + ... + 82313313.

It is an arithmetic number, because the mean of its divisors is an integer number (3292527240).

Almost surely, 2^21895306013 is an apocalyptic number.

It is an amenable number.

21895306013 is a deficient number, since it is larger than the sum of its proper divisors (4444911907).

21895306013 is a wasteful number, since it uses less digits than its factorization.

21895306013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164626387.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 21895306013 in words is "twenty-one billion, eight hundred ninety-five million, three hundred six thousand, thirteen".