21000110221212 has 24 divisors (see below), whose sum is σ = 49000886765712. Its totient is φ = 6999946800000.

The previous prime is 21000110221177. The next prime is 21000110221291. The reversal of 21000110221212 is 21212201100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000110221191 and 21000110221200.

It is a congruent number.

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, 10266289 + ... + 12140712.

It is an arithmetic number, because the mean of its divisors is an integer number (2041703615238).

Almost surely, 2^{21000110221212} is an apocalyptic number.

It is an amenable number.

21000110221212 is an abundant number, since it is smaller than the sum of its proper divisors (28000776544500).

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

21000110221212 is a wasteful number, since it uses less digits than its factorization.

21000110221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22485109 (or 22485107 counting only the distinct ones).

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

Adding to 21000110221212 its reverse (21212201100012), we get a palindrome (42212311321224).

The spelling of 21000110221212 in words is "twenty-one trillion, one hundred ten million, two hundred twenty-one thousand, two hundred twelve".