21202110212 has 6 divisors (see below), whose sum is σ = 37103692878. Its totient is φ = 10601055104.

The previous prime is 21202110211. The next prime is 21202110229. The reversal of 21202110212 is 21201120212.

It can be written as a sum of positive squares in only one way, i.e., 20740032196 + 462078016 = 144014^2 + 21496^2 .

It is not an unprimeable number, because it can be changed into a prime (21202110211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2650263773 + ... + 2650263780.

It is an arithmetic number, because the mean of its divisors is an integer number (6183948813).

Almost surely, 2^21202110212 is an apocalyptic number.

It is an amenable number.

21202110212 is a deficient number, since it is larger than the sum of its proper divisors (15901582666).

21202110212 is a wasteful number, since it uses less digits than its factorization.

21202110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300527557 (or 5300527555 counting only the distinct ones).

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

Adding to 21202110212 its reverse (21201120212), we get a palindrome (42403230424).

The spelling of 21202110212 in words is "twenty-one billion, two hundred two million, one hundred ten thousand, two hundred twelve".