21134221206 has 16 divisors (see below), whose sum is σ = 48306791424. Its totient is φ = 6038348904.

The previous prime is 21134221183. The next prime is 21134221219. The reversal of 21134221206 is 60212243112.

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, 251597830 + ... + 251597913.

It is an arithmetic number, because the mean of its divisors is an integer number (3019174464).

Almost surely, 2^21134221206 is an apocalyptic number.

21134221206 is an abundant number, since it is smaller than the sum of its proper divisors (27172570218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21134221206 is a wasteful number, since it uses less digits than its factorization.

21134221206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503195755.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 21134221206 its reverse (60212243112), we get a palindrome (81346464318).

The spelling of 21134221206 in words is "twenty-one billion, one hundred thirty-four million, two hundred twenty-one thousand, two hundred six".