221212100010000 has 200 divisors, whose sum is σ = 779020532557344. Its totient is φ = 53627175680000.

The previous prime is 221212100009969. The next prime is 221212100010007. The reversal of 221212100010000 is 10001212122.

It is a tau number, because it is divible by the number of its divisors (200).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (221212100010007) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 334839849 + ... + 335499848.

Almost surely, 2^{221212100010000} is an apocalyptic number.

221212100010000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221212100010000 is an abundant number, since it is smaller than the sum of its proper divisors (557808432547344).

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

221212100010000 is a wasteful number, since it uses less digits than its factorization.

221212100010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670339739 (or 670339718 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221212100010000 its reverse (10001212122), we get a palindrome (221222101222122).

The spelling of 221212100010000 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred million, ten thousand".