221212120101 has 32 divisors (see below), whose sum is σ = 361431613440. Its totient is φ = 117465244416.

The previous prime is 221212120069. The next prime is 221212120109. The reversal of 221212120101 is 101021212122.

It is not a de Polignac number, because 221212120101 - 2⁵ = 221212120069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212120109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3893581 + ... + 3949986.

It is an arithmetic number, because the mean of its divisors is an integer number (11294737920).

Almost surely, 2^221212120101 is an apocalyptic number.

221212120101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221212120101 is a deficient number, since it is larger than the sum of its proper divisors (140219493339).

221212120101 is a wasteful number, since it uses less digits than its factorization.

221212120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7843673.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221212120101 its reverse (101021212122), we get a palindrome (322233332223).

The spelling of 221212120101 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, one hundred one".