21221300212 has 48 divisors (see below), whose sum is σ = 42863708160. Its totient is φ = 9005004000.

The previous prime is 21221300207. The next prime is 21221300231. The reversal of 21221300212 is 21200312212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1306839 + ... + 1322977.

It is an arithmetic number, because the mean of its divisors is an integer number (892993920).

Almost surely, 2^21221300212 is an apocalyptic number.

It is an amenable number.

21221300212 is an abundant number, since it is smaller than the sum of its proper divisors (21642407948).

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

21221300212 is a wasteful number, since it uses less digits than its factorization.

21221300212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16612 (or 16610 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21221300212 its reverse (21200312212), we get a palindrome (42421612424).

The spelling of 21221300212 in words is "twenty-one billion, two hundred twenty-one million, three hundred thousand, two hundred twelve".