211121200100021 has 8 divisors (see below), whose sum is σ = 211883857788960. Its totient is φ = 210358545917328.

The previous prime is 211121200100003. The next prime is 211121200100023. The reversal of 211121200100021 is 120001002121112.

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 211121200100021 - 2¹⁰ = 211121200098997 is a prime.

It is a super-2 number, since 2×211121200100021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211121200099969 and 211121200100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121200100023) 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, 220931270 + ... + 221884808.

It is an arithmetic number, because the mean of its divisors is an integer number (26485482223620).

Almost surely, 2^{211121200100021} is an apocalyptic number.

It is an amenable number.

211121200100021 is a deficient number, since it is larger than the sum of its proper divisors (762657688939).

211121200100021 is an equidigital number, since it uses as much as digits as its factorization.

211121200100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753123.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211121200100021 its reverse (120001002121112), we get a palindrome (331122202221133).

The spelling of 211121200100021 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred million, one hundred thousand, twenty-one".