212220101 has 4 divisors (see below), whose sum is σ = 223389600. Its totient is φ = 201050604.

The previous prime is 212220097. The next prime is 212220119. The reversal of 212220101 is 101022212.

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 212220101 - 2² = 212220097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5584721 + ... + 5584758.

It is an arithmetic number, because the mean of its divisors is an integer number (55847400).

Almost surely, 2^212220101 is an apocalyptic number.

It is an amenable number.

212220101 is a deficient number, since it is larger than the sum of its proper divisors (11169499).

212220101 is a wasteful number, since it uses less digits than its factorization.

212220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11169498.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 212220101 is about 14567.7761171704. The cubic root of 212220101 is about 596.4794771178.

Adding to 212220101 its reverse (101022212), we get a palindrome (313242313).

The spelling of 212220101 in words is "two hundred twelve million, two hundred twenty thousand, one hundred one".