211200111212021 has 4 divisors (see below), whose sum is σ = 218013018025344. Its totient is φ = 204387204398700.

The previous prime is 211200111211997. The next prime is 211200111212147. The reversal of 211200111212021 is 120212111002112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211200111212021 - 2¹⁴ = 211200111195637 is a prime.

It is a super-2 number, since 2×211200111212021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211200111212921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3406453406615 + ... + 3406453406676.

It is an arithmetic number, because the mean of its divisors is an integer number (54503254506336).

Almost surely, 2^{211200111212021} is an apocalyptic number.

It is an amenable number.

211200111212021 is a deficient number, since it is larger than the sum of its proper divisors (6812906813323).

211200111212021 is an equidigital number, since it uses as much as digits as its factorization.

211200111212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6812906813322.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 211200111212021 its reverse (120212111002112), we get a palindrome (331412222214133).

The spelling of 211200111212021 in words is "two hundred eleven trillion, two hundred billion, one hundred eleven million, two hundred twelve thousand, twenty-one".