211220213101 has 4 divisors (see below), whose sum is σ = 211380108604. Its totient is φ = 211060317600.

The previous prime is 211220213063. The next prime is 211220213147. The reversal of 211220213101 is 101312022112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104166917001 + 107053296100 = 322749^2 + 327190^2 .

It is a cyclic number.

It is not a de Polignac number, because 211220213101 - 2⁹ = 211220212589 is a prime.

It is a super-2 number, since 2×211220213101² (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 (211220213161) 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, 79945770 + ... + 79948411.

It is an arithmetic number, because the mean of its divisors is an integer number (52845027151).

Almost surely, 2^211220213101 is an apocalyptic number.

It is an amenable number.

211220213101 is a deficient number, since it is larger than the sum of its proper divisors (159895503).

211220213101 is a wasteful number, since it uses less digits than its factorization.

211220213101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159895502.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 211220213101 its reverse (101312022112), we get a palindrome (312532235213).

The spelling of 211220213101 in words is "two hundred eleven billion, two hundred twenty million, two hundred thirteen thousand, one hundred one".