21221010010212 has 24 divisors (see below), whose sum is σ = 49767038709696. Its totient is φ = 7037763048288.

The previous prime is 21221010010147. The next prime is 21221010010273. The reversal of 21221010010212 is 21201001012212.

It is a junction number, because it is equal to n+sod(n) for n = 21221010010191 and 21221010010200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4488366928 + ... + 4488371655.

It is an arithmetic number, because the mean of its divisors is an integer number (2073626612904).

Almost surely, 2^{21221010010212} is an apocalyptic number.

It is an amenable number.

21221010010212 is an abundant number, since it is smaller than the sum of its proper divisors (28546028699484).

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

21221010010212 is a wasteful number, since it uses less digits than its factorization.

21221010010212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8976738787 (or 8976738785 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221010010212 its reverse (21201001012212), we get a palindrome (42422011022424).

The spelling of 21221010010212 in words is "twenty-one trillion, two hundred twenty-one billion, ten million, ten thousand, two hundred twelve".