221021100212 has 24 divisors (see below), whose sum is σ = 422016490560. Its totient is φ = 100448156160.

The previous prime is 221021100203. The next prime is 221021100233. The reversal of 221021100212 is 212001120122.

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, 117512 + ... + 675167.

It is an arithmetic number, because the mean of its divisors is an integer number (17584020440).

Almost surely, 2^221021100212 is an apocalyptic number.

221021100212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221021100212 is a deficient number, since it is larger than the sum of its proper divisors (200995390348).

221021100212 is a wasteful number, since it uses less digits than its factorization.

221021100212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799031 (or 799029 counting only the distinct ones).

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

Adding to 221021100212 its reverse (212001120122), we get a palindrome (433022220334).

The spelling of 221021100212 in words is "two hundred twenty-one billion, twenty-one million, one hundred thousand, two hundred twelve".