211212211221101 has 4 divisors (see below), whose sum is σ = 211214317735104. Its totient is φ = 211210104707100.

The previous prime is 211212211221071. The next prime is 211212211221103. The reversal of 211212211221101 is 101122112212112.

It is a happy number.

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 211212211221101 - 2¹⁴ = 211212211204717 is a prime.

It is a super-2 number, since 2×211212211221101² (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 (211212211221103) 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, 1053106595 + ... + 1053307136.

It is an arithmetic number, because the mean of its divisors is an integer number (52803579433776).

Almost surely, 2^{211212211221101} is an apocalyptic number.

It is an amenable number.

211212211221101 is a deficient number, since it is larger than the sum of its proper divisors (2106514003).

211212211221101 is a wasteful number, since it uses less digits than its factorization.

211212211221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2106514002.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211212211221101 its reverse (101122112212112), we get a palindrome (312334323433213).

The spelling of 211212211221101 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred eleven million, two hundred twenty-one thousand, one hundred one".