211220222101 has 4 divisors (see below), whose sum is σ = 241394539552. Its totient is φ = 181045904652.

The previous prime is 211220222089. The next prime is 211220222119. The reversal of 211220222101 is 101222022112.

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 211220222101 - 2¹⁵ = 211220189333 is a prime.

It is a super-5 number, since 5×211220222101⁵ (a number of 58 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220222131) 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, 15087158715 + ... + 15087158728.

It is an arithmetic number, because the mean of its divisors is an integer number (60348634888).

Almost surely, 2^211220222101 is an apocalyptic number.

It is an amenable number.

211220222101 is a deficient number, since it is larger than the sum of its proper divisors (30174317451).

211220222101 is an equidigital number, since it uses as much as digits as its factorization.

211220222101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30174317450.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 211220222101 its reverse (101222022112), we get a palindrome (312442244213).

The spelling of 211220222101 in words is "two hundred eleven billion, two hundred twenty million, two hundred twenty-two thousand, one hundred one".