211221221202 has 24 divisors (see below), whose sum is σ = 457670519436. Its totient is φ = 70403298336.

The previous prime is 211221221191. The next prime is 211221221203. The reversal of 211221221202 is 202122122112.

It is a happy number.

211221221202 is a `hidden beast` number, since 21 + 1 + 221 + 221 + 202 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 205054103241 + 6167117961 = 452829^2 + 78531^2 .

It is a super-2 number, since 2×211221221202² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (211221221203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41268 + ... + 651264.

Almost surely, 2^211221221202 is an apocalyptic number.

211221221202 is an abundant number, since it is smaller than the sum of its proper divisors (246449298234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211221221202 is a wasteful number, since it uses less digits than its factorization.

211221221202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629242 (or 629239 counting only the distinct ones).

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

Adding to 211221221202 its reverse (202122122112), we get a palindrome (413343343314).

The spelling of 211221221202 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred two".