221121210100212 has 24 divisors (see below), whose sum is σ = 573277211371200. Its totient is φ = 73707070033368.

The previous prime is 221121210100211. The next prime is 221121210100243. The reversal of 221121210100212 is 212001012121122.

221121210100212 is a `hidden beast` number, since 2 + 21 + 121 + 210 + 100 + 212 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121210100211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1023709305912 + ... + 1023709306127.

It is an arithmetic number, because the mean of its divisors is an integer number (23886550473800).

Almost surely, 2^{221121210100212} is an apocalyptic number.

It is an amenable number.

221121210100212 is an abundant number, since it is smaller than the sum of its proper divisors (352156001270988).

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

221121210100212 is a wasteful number, since it uses less digits than its factorization.

221121210100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2047418612052 (or 2047418612044 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221121210100212 its reverse (212001012121122), we get a palindrome (433122222221334).

The spelling of 221121210100212 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred ten million, one hundred thousand, two hundred twelve".