11211100021 has 8 divisors (see below), whose sum is σ = 12490510464. Its totient is φ = 9975059520.

The previous prime is 11211100003. The next prime is 11211100031. The reversal of 11211100021 is 12000111211.

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 11211100021 - 2¹⁵ = 11211067253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11211099980 and 11211100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211100031) 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, 10841940 + ... + 10842973.

It is an arithmetic number, because the mean of its divisors is an integer number (1561313808).

Almost surely, 2^11211100021 is an apocalyptic number.

11211100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11211100021 is a deficient number, since it is larger than the sum of its proper divisors (1279410443).

11211100021 is a wasteful number, since it uses less digits than its factorization.

11211100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21684971.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 11211100021 its reverse (12000111211), we get a palindrome (23211211232).

The spelling of 11211100021 in words is "eleven billion, two hundred eleven million, one hundred thousand, twenty-one".