221212022212110 has 128 divisors (see below), whose sum is σ = 577401801338880. Its totient is φ = 54012786038784.

The previous prime is 221212022212081. The next prime is 221212022212169. The reversal of 221212022212110 is 11212220212122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 155668381 + ... + 157082999.

It is an arithmetic number, because the mean of its divisors is an integer number (4510951572960).

Almost surely, 2^{221212022212110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221212022212110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288700900669440).

221212022212110 is an abundant number, since it is smaller than the sum of its proper divisors (356189779126770).

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

221212022212110 is a wasteful number, since it uses less digits than its factorization.

221212022212110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422970.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221212022212110 its reverse (11212220212122), we get a palindrome (232424242424232).

The spelling of 221212022212110 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-two million, two hundred twelve thousand, one hundred ten".