221222212210000 has 100 divisors (see below), whose sum is σ = 535942936262272. Its totient is φ = 88432408368000.

The previous prime is 221222212209967. The next prime is 221222212210003. The reversal of 221222212210000 is 12212222122.

It is a tau number, because it is divible by the number of its divisors (100).

It is a self number, because there is not a number n which added to its sum of digits gives 221222212210000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222212210003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8611219 + ... + 22728781.

Almost surely, 2^{221222212210000} is an apocalyptic number.

221222212210000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221222212210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267971468131136).

221222212210000 is an abundant number, since it is smaller than the sum of its proper divisors (314720724052272).

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

221222212210000 is a wasteful number, since it uses less digits than its factorization.

221222212210000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14119158 (or 14119137 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221222212210000 its reverse (12212222122), we get a palindrome (221234424432122).

The spelling of 221222212210000 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, two hundred ten thousand".