21011101101021 has 8 divisors (see below), whose sum is σ = 29232836314560. Its totient is φ = 13398383310752.

The previous prime is 21011101100989. The next prime is 21011101101059. The reversal of 21011101101021 is 12010110111012.

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 21011101101021 - 2⁵ = 21011101100989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011101100988 and 21011101101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011101109021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152254355736 + ... + 152254355873.

It is an arithmetic number, because the mean of its divisors is an integer number (3654104539320).

Almost surely, 2^{21011101101021} is an apocalyptic number.

It is an amenable number.

21011101101021 is a deficient number, since it is larger than the sum of its proper divisors (8221735213539).

21011101101021 is a wasteful number, since it uses less digits than its factorization.

21011101101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304508711635.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21011101101021 its reverse (12010110111012), we get a palindrome (33021211212033).

Subtracting from 21011101101021 its reverse (12010110111012), we obtain a palindrome (9000990990009).

The spelling of 21011101101021 in words is "twenty-one trillion, eleven billion, one hundred one million, one hundred one thousand, twenty-one".