21121011101 has 8 divisors (see below), whose sum is σ = 21560679360. Its totient is φ = 20684065792.

The previous prime is 21121011091. The next prime is 21121011161. The reversal of 21121011101 is 10111012112.

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 21121011101 - 2³⁴ = 3941141917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121011161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 665060 + ... + 696093.

It is an arithmetic number, because the mean of its divisors is an integer number (2695084920).

Almost surely, 2^21121011101 is an apocalyptic number.

It is an amenable number.

21121011101 is a deficient number, since it is larger than the sum of its proper divisors (439668259).

21121011101 is a wasteful number, since it uses less digits than its factorization.

21121011101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361475.

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

Adding to 21121011101 its reverse (10111012112), we get a palindrome (31232023213).

It can be divided in two parts, 2112 and 1011101, that multiplied together give a palindrome (2135445312).

The spelling of 21121011101 in words is "twenty-one billion, one hundred twenty-one million, eleven thousand, one hundred one".