11101001010021 has 72 divisors (see below), whose sum is σ = 19183788726336. Its totient is φ = 6149993541120.

The previous prime is 11101001010019. The next prime is 11101001010031. The reversal of 11101001010021 is 12001010010111.

It is not a de Polignac number, because 11101001010021 - 2¹ = 11101001010019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 11101001009985 and 11101001010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101001010031) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8738395 + ... + 9927816.

It is an arithmetic number, because the mean of its divisors is an integer number (266441510088).

Almost surely, 2^{11101001010021} is an apocalyptic number.

It is an amenable number.

11101001010021 is a deficient number, since it is larger than the sum of its proper divisors (8082787716315).

11101001010021 is a wasteful number, since it uses less digits than its factorization.

11101001010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18666283 (or 18666267 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 11101001010021 its reverse (12001010010111), we get a palindrome (23102011020132).

The spelling of 11101001010021 in words is "eleven trillion, one hundred one billion, one million, ten thousand, twenty-one".