221210222212122 has 128 divisors (see below), whose sum is σ = 525883256236800. Its totient is φ = 61151086080000.

The previous prime is 221210222212117. The next prime is 221210222212163. The reversal of 221210222212122 is 221212222012122.

It is a happy number.

It is a super-2 number, since 2×221210222212122² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221210222212092 and 221210222212101.

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, 44522754 + ... + 49241202.

It is an arithmetic number, because the mean of its divisors is an integer number (4108462939350).

Almost surely, 2^{221210222212122} is an apocalyptic number.

221210222212122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 221210222212122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262941628118400).

221210222212122 is an abundant number, since it is smaller than the sum of its proper divisors (304673034024678).

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

221210222212122 is a wasteful number, since it uses less digits than its factorization.

221210222212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4719120.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 221210222212122 its reverse (221212222012122), we get a palindrome (442422444224244).

The spelling of 221210222212122 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twenty-two".