21101302212 has 12 divisors (see below), whose sum is σ = 49236371856. Its totient is φ = 7033767400.

The previous prime is 21101302199. The next prime is 21101302223. The reversal of 21101302212 is 21220310112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21101302191 and 21101302200.

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 3 ways as a sum of consecutive naturals, for example, 879220914 + ... + 879220937.

It is an arithmetic number, because the mean of its divisors is an integer number (4103030988).

Almost surely, 2^21101302212 is an apocalyptic number.

It is an amenable number.

21101302212 is an abundant number, since it is smaller than the sum of its proper divisors (28135069644).

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

21101302212 is a wasteful number, since it uses less digits than its factorization.

21101302212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758441858 (or 1758441856 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21101302212 its reverse (21220310112), we get a palindrome (42321612324).

The spelling of 21101302212 in words is "twenty-one billion, one hundred one million, three hundred two thousand, two hundred twelve".