210001212122 has 16 divisors (see below), whose sum is σ = 342591471432. Its totient is φ = 95963995200.

The previous prime is 210001212073. The next prime is 210001212151. The reversal of 210001212122 is 221212100012.

It can be written as a sum of positive squares in 4 ways, for example, as 209992146001 + 9066121 = 458249^2 + 3011^2 .

It is a junction number, because it is equal to n+sod(n) for n = 210001212097 and 210001212106.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 39982373 + ... + 39987624.

Almost surely, 2^210001212122 is an apocalyptic number.

210001212122 is a deficient number, since it is larger than the sum of its proper divisors (132590259310).

210001212122 is a wasteful number, since it uses less digits than its factorization.

210001212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79970113.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210001212122 its reverse (221212100012), we get a palindrome (431213312134).

The spelling of 210001212122 in words is "two hundred ten billion, one million, two hundred twelve thousand, one hundred twenty-two".