21095607955 has 8 divisors (see below), whose sum is σ = 26803831392. Its totient is φ = 15883751808.

The previous prime is 21095607913. The next prime is 21095607959. The reversal of 21095607955 is 55970659012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21095607955 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21095607899 and 21095607908.

It is not an unprimeable number, because it can be changed into a prime (21095607959) 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, 124091727 + ... + 124091896.

It is an arithmetic number, because the mean of its divisors is an integer number (3350478924).

Almost surely, 2^21095607955 is an apocalyptic number.

21095607955 is a deficient number, since it is larger than the sum of its proper divisors (5708223437).

21095607955 is a wasteful number, since it uses less digits than its factorization.

21095607955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248183645.

The product of its (nonzero) digits is 850500, while the sum is 49.

The spelling of 21095607955 in words is "twenty-one billion, ninety-five million, six hundred seven thousand, nine hundred fifty-five".