211121212000021 has 8 divisors (see below), whose sum is σ = 214699890679200. Its totient is φ = 207542545089360.

The previous prime is 211121211999983. The next prime is 211121212000037. The reversal of 211121212000021 is 120000212121112.

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 211121212000021 - 2¹⁷ = 211121211868949 is a prime.

It is a super-2 number, since 2×211121212000021² (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 = 211121211999959 and 211121212000004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121212030021) 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, 38037990 + ... + 43233448.

It is an arithmetic number, because the mean of its divisors is an integer number (26837486334900).

Almost surely, 2^{211121212000021} is an apocalyptic number.

It is an amenable number.

211121212000021 is a deficient number, since it is larger than the sum of its proper divisors (3578678679179).

211121212000021 is an equidigital number, since it uses as much as digits as its factorization.

211121212000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5884259.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211121212000021 its reverse (120000212121112), we get a palindrome (331121424121133).

The spelling of 211121212000021 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred twelve million, twenty-one", and thus it is an aban number.