21022100212 has 6 divisors (see below), whose sum is σ = 36788675378. Its totient is φ = 10511050104.

The previous prime is 21022100179. The next prime is 21022100221. The reversal of 21022100212 is 21200122012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11332454116 + 9689646096 = 106454^2 + 98436^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21022100192 and 21022100201.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2627762523 + ... + 2627762530.

Almost surely, 2^21022100212 is an apocalyptic number.

It is an amenable number.

21022100212 is a deficient number, since it is larger than the sum of its proper divisors (15766575166).

21022100212 is a wasteful number, since it uses less digits than its factorization.

21022100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255525057 (or 5255525055 counting only the distinct ones).

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

Adding to 21022100212 its reverse (21200122012), we get a palindrome (42222222224).

The spelling of 21022100212 in words is "twenty-one billion, twenty-two million, one hundred thousand, two hundred twelve".