210221221122 has 48 divisors (see below), whose sum is σ = 504302771232. Its totient is φ = 62752599360.

The previous prime is 210221221079. The next prime is 210221221141. The reversal of 210221221122 is 221122122012.

It is a happy number.

210221221122 is a `hidden beast` number, since 210 + 221 + 2 + 211 + 22 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 210221221095 and 210221221104.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7910043 + ... + 7936574.

It is an arithmetic number, because the mean of its divisors is an integer number (10506307734).

Almost surely, 2^210221221122 is an apocalyptic number.

210221221122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

210221221122 is an abundant number, since it is smaller than the sum of its proper divisors (294081550110).

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

210221221122 is a wasteful number, since it uses less digits than its factorization.

210221221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15846703 (or 15846700 counting only the distinct ones).

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

Adding to 210221221122 its reverse (221122122012), we get a palindrome (431343343134).

The spelling of 210221221122 in words is "two hundred ten billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".