211220222122 has 24 divisors (see below), whose sum is σ = 396908331876. Its totient is φ = 83559647808.

The previous prime is 211220222119. The next prime is 211220222123. The reversal of 211220222122 is 221222022112.

It can be written as a sum of positive squares in 2 ways, for example, as 147670349841 + 63549872281 = 384279^2 + 252091^2 .

It is a super-2 number, since 2×211220222122² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211220222122.

It is not an unprimeable number, because it can be changed into a prime (211220222123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82895203 + ... + 82897750.

Almost surely, 2^211220222122 is an apocalyptic number.

211220222122 is a deficient number, since it is larger than the sum of its proper divisors (185688109754).

211220222122 is a wasteful number, since it uses less digits than its factorization.

211220222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165792982 (or 165792975 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 211220222122 its reverse (221222022112), we get a palindrome (432442244234).

The spelling of 211220222122 in words is "two hundred eleven billion, two hundred twenty million, two hundred twenty-two thousand, one hundred twenty-two".