21002102212 has 24 divisors (see below), whose sum is σ = 45235297856. Its totient is φ = 8308523808.

The previous prime is 21002102207. The next prime is 21002102213. The reversal of 21002102212 is 21220120012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21002102192 and 21002102201.

It is not an unprimeable number, because it can be changed into a prime (21002102213) 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 7 ways as a sum of consecutive naturals, for example, 28848678 + ... + 28849405.

Almost surely, 2^21002102212 is an apocalyptic number.

It is an amenable number.

21002102212 is an abundant number, since it is smaller than the sum of its proper divisors (24233195644).

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

21002102212 is a wasteful number, since it uses less digits than its factorization.

21002102212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57698107 (or 57698105 counting only the distinct ones).

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

Adding to 21002102212 its reverse (21220120012), we get a palindrome (42222222224).

The spelling of 21002102212 in words is "twenty-one billion, two million, one hundred two thousand, two hundred twelve".