21235650005 has 8 divisors (see below), whose sum is σ = 25531694424. Its totient is φ = 16955910400.

The previous prime is 21235649999. The next prime is 21235650017. The reversal of 21235650005 is 50005653212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1117631761 + 20118018244 = 33431^2 + 141838^2 .

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

It is not a de Polignac number, because 21235650005 - 2¹⁰ = 21235648981 is a prime.

It is a super-2 number, since 2×21235650005² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21235650005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4073336 + ... + 4078545.

It is an arithmetic number, because the mean of its divisors is an integer number (3191461803).

Almost surely, 2^21235650005 is an apocalyptic number.

It is an amenable number.

21235650005 is a deficient number, since it is larger than the sum of its proper divisors (4296044419).

21235650005 is an equidigital number, since it uses as much as digits as its factorization.

21235650005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8152407.

The product of its (nonzero) digits is 9000, while the sum is 29.

The spelling of 21235650005 in words is "twenty-one billion, two hundred thirty-five million, six hundred fifty thousand, five".