21122000212 has 12 divisors (see below), whose sum is σ = 36968892660. Its totient is φ = 10559459456.

The previous prime is 21122000209. The next prime is 21122000213. The reversal of 21122000212 is 21200022112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18202327056 + 2919673156 = 134916^2 + 54034^2 .

It is a super-2 number, since 2×21122000212² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122000192 and 21122000201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122000213) 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 3 ways as a sum of consecutive naturals, for example, 354037 + ... + 409372.

It is an arithmetic number, because the mean of its divisors is an integer number (3080741055).

Almost surely, 2^21122000212 is an apocalyptic number.

It is an amenable number.

21122000212 is a deficient number, since it is larger than the sum of its proper divisors (15846892448).

21122000212 is a wasteful number, since it uses less digits than its factorization.

21122000212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770330 (or 770328 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21122000212 its reverse (21200022112), we get a palindrome (42322022324).

The spelling of 21122000212 in words is "twenty-one billion, one hundred twenty-two million, two hundred twelve", and thus it is an aban number.