211122222021 has 24 divisors (see below), whose sum is σ = 305519104800. Its totient is φ = 140487732000.

The previous prime is 211122222011. The next prime is 211122222071. The reversal of 211122222021 is 120222221112.

It is a happy number.

It is not a de Polignac number, because 211122222021 - 2¹³ = 211122213829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211122221985 and 211122222003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211122222001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11161630 + ... + 11180528.

It is an arithmetic number, because the mean of its divisors is an integer number (12729962700).

Almost surely, 2^211122222021 is an apocalyptic number.

It is an amenable number.

211122222021 is a deficient number, since it is larger than the sum of its proper divisors (94396882779).

211122222021 is a wasteful number, since it uses less digits than its factorization.

211122222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21137 (or 21134 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211122222021 its reverse (120222221112), we get a palindrome (331344443133).

Subtracting from 211122222021 its reverse (120222221112), we obtain a palindrome (90900000909).

The spelling of 211122222021 in words is "two hundred eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, twenty-one".