21011121106 has 8 divisors (see below), whose sum is σ = 32368483980. Its totient is φ = 10221626448.

The previous prime is 21011121073. The next prime is 21011121127. The reversal of 21011121106 is 60112111012.

It can be written as a sum of positive squares in 2 ways, for example, as 20818161225 + 192959881 = 144285^2 + 13891^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21011121106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141966961 + ... + 141967108.

Almost surely, 2^21011121106 is an apocalyptic number.

21011121106 is a deficient number, since it is larger than the sum of its proper divisors (11357362874).

21011121106 is a wasteful number, since it uses less digits than its factorization.

21011121106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283934108.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21011121106 its reverse (60112111012), we get a palindrome (81123232118).

The spelling of 21011121106 in words is "twenty-one billion, eleven million, one hundred twenty-one thousand, one hundred six".