21212220011000 has 32 divisors (see below), whose sum is σ = 49636594828080. Its totient is φ = 8484888004000.

The previous prime is 21212220010997. The next prime is 21212220011083. The reversal of 21212220011000 is 11002221212.

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, 10606109006 + ... + 10606111005.

Almost surely, 2^{21212220011000} is an apocalyptic number.

21212220011000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212220011000 is an abundant number, since it is smaller than the sum of its proper divisors (28424374817080).

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

21212220011000 is a wasteful number, since it uses less digits than its factorization.

21212220011000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21212220032 (or 21212220018 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21212220011000 its reverse (11002221212), we get a palindrome (21223222232212).

The spelling of 21212220011000 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty million, eleven thousand".