221212101022 has 24 divisors (see below), whose sum is σ = 368336923416. Its totient is φ = 99555390000.

The previous prime is 221212100981. The next prime is 221212101023. The reversal of 221212101022 is 220101212122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221212100987 and 221212101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212101023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4500804 + ... + 4549687.

It is an arithmetic number, because the mean of its divisors is an integer number (15347371809).

Almost surely, 2^221212101022 is an apocalyptic number.

221212101022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221212101022 is a deficient number, since it is larger than the sum of its proper divisors (147124822394).

221212101022 is a wasteful number, since it uses less digits than its factorization.

221212101022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9050616 (or 9050605 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221212101022 its reverse (220101212122), we get a palindrome (441313313144).

Subtracting from 221212101022 its reverse (220101212122), we obtain a square (1110888900 = 33330²).

The spelling of 221212101022 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred one thousand, twenty-two".