21221012100212 has 48 divisors (see below), whose sum is σ = 37354988119680. Its totient is φ = 10548355289472.

The previous prime is 21221012100163. The next prime is 21221012100217. The reversal of 21221012100212 is 21200121012212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221012100217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2551518278 + ... + 2551526594.

It is an arithmetic number, because the mean of its divisors is an integer number (778228919160).

Almost surely, 2^{21221012100212} is an apocalyptic number.

It is an amenable number.

21221012100212 is a deficient number, since it is larger than the sum of its proper divisors (16133976019468).

21221012100212 is a wasteful number, since it uses less digits than its factorization.

21221012100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13800 (or 13798 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21221012100212 its reverse (21200121012212), we get a palindrome (42421133112424).

The spelling of 21221012100212 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, one hundred thousand, two hundred twelve".