21436050506 has 32 divisors (see below), whose sum is σ = 34968181248. Its totient is φ = 9796389120.

The previous prime is 21436050491. The next prime is 21436050509. The reversal of 21436050506 is 60505063412.

It is a super-2 number, since 2×21436050506² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21436050509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3613715 + ... + 3619641.

It is an arithmetic number, because the mean of its divisors is an integer number (1092755664).

Almost surely, 2^21436050506 is an apocalyptic number.

21436050506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21436050506 is a deficient number, since it is larger than the sum of its proper divisors (13532130742).

21436050506 is a wasteful number, since it uses less digits than its factorization.

21436050506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7286.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 21436050506 in words is "twenty-one billion, four hundred thirty-six million, fifty thousand, five hundred six".