211221212101 has 8 divisors (see below), whose sum is σ = 211520017184. Its totient is φ = 210922503120.

The previous prime is 211221212099. The next prime is 211221212107. The reversal of 211221212101 is 101212122112.

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 211221212101 - 2¹ = 211221212099 is a prime.

It is a super-2 number, since 2×211221212101² (a number of 23 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 (211221212107) 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, 5148070 + ... + 5188936.

It is an arithmetic number, because the mean of its divisors is an integer number (26440002148).

Almost surely, 2^211221212101 is an apocalyptic number.

It is an amenable number.

211221212101 is a deficient number, since it is larger than the sum of its proper divisors (298805083).

211221212101 is an equidigital number, since it uses as much as digits as its factorization.

211221212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48051.

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

Adding to 211221212101 its reverse (101212122112), we get a palindrome (312433334213).

The spelling of 211221212101 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, one hundred one".