21011121101 has 8 divisors (see below), whose sum is σ = 22331699520. Its totient is φ = 19712015712.

The previous prime is 21011121073. The next prime is 21011121127. The reversal of 21011121101 is 10112111012.

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

It is a cyclic number.

It is not a de Polignac number, because 21011121101 - 2³⁴ = 3831251917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011121301) 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 7 ways as a sum of consecutive naturals, for example, 5366240 + ... + 5370153.

It is an arithmetic number, because the mean of its divisors is an integer number (2791462440).

Almost surely, 2^21011121101 is an apocalyptic number.

It is an amenable number.

21011121101 is a deficient number, since it is larger than the sum of its proper divisors (1320578419).

21011121101 is a wasteful number, since it uses less digits than its factorization.

21011121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10736515.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21011121101 its reverse (10112111012), we get a palindrome (31123232113).

The spelling of 21011121101 in words is "twenty-one billion, eleven million, one hundred twenty-one thousand, one hundred one".