211111022221 has 16 divisors (see below), whose sum is σ = 236355134400. Its totient is φ = 186935299200.

The previous prime is 211111022207. The next prime is 211111022237. The reversal of 211111022221 is 122220111112.

It is a cyclic number.

It is not a de Polignac number, because 211111022221 - 2¹³ = 211111014029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211111022195 and 211111022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211111022201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1421400 + ... + 1562881.

It is an arithmetic number, because the mean of its divisors is an integer number (14772195900).

Almost surely, 2^211111022221 is an apocalyptic number.

It is an amenable number.

211111022221 is a deficient number, since it is larger than the sum of its proper divisors (25244112179).

211111022221 is a wasteful number, since it uses less digits than its factorization.

211111022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2984460.

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

Adding to 211111022221 its reverse (122220111112), we get a palindrome (333331133333).

The spelling of 211111022221 in words is "two hundred eleven billion, one hundred eleven million, twenty-two thousand, two hundred twenty-one".