21212000010 has 64 divisors (see below), whose sum is σ = 59024712960. Its totient is φ = 5410595520.

The previous prime is 21211999979. The next prime is 21212000021. The reversal of 21212000010 is 1000021212.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21211999956 and 21212000001.

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 31 ways as a sum of consecutive naturals, for example, 1701681 + ... + 1714100.

It is an arithmetic number, because the mean of its divisors is an integer number (922261140).

Almost surely, 2^21212000010 is an apocalyptic number.

21212000010 is an abundant number, since it is smaller than the sum of its proper divisors (37812712950).

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

21212000010 is a wasteful number, since it uses less digits than its factorization.

21212000010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415820 (or 3415814 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21212000010 its reverse (1000021212), we get a palindrome (22212021222).

The spelling of 21212000010 in words is "twenty-one billion, two hundred twelve million, ten", and thus it is an aban number.