1212110221 has 8 divisors (see below), whose sum is σ = 1385497280. Its totient is φ = 1038780288.

The previous prime is 1212110209. The next prime is 1212110227. The reversal of 1212110221 is 1220112121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1212110221 - 2⁹ = 1212109709 is a prime.

It is a super-2 number, since 2×1212110221² = 2938422375705337682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212110227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51250 + ... + 71068.

It is an arithmetic number, because the mean of its divisors is an integer number (173187160).

Almost surely, 2^1212110221 is an apocalyptic number.

It is an amenable number.

1212110221 is a deficient number, since it is larger than the sum of its proper divisors (173387059).

1212110221 is an equidigital number, since it uses as much as digits as its factorization.

1212110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28563.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1212110221 is about 34815.3733428208. The cubic root of 1212110221 is about 1066.2213415258.

Adding to 1212110221 its reverse (1220112121), we get a palindrome (2432222342).

The spelling of 1212110221 in words is "one billion, two hundred twelve million, one hundred ten thousand, two hundred twenty-one".