1212000221 has 8 divisors (see below), whose sum is σ = 1242032064. Its totient is φ = 1181990880.

The previous prime is 1212000217. The next prime is 1212000263. The reversal of 1212000221 is 1220002121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1212000221 - 2² = 1212000217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212020221) 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, 170480 + ... + 177446.

It is an arithmetic number, because the mean of its divisors is an integer number (155254008).

Almost surely, 2^1212000221 is an apocalyptic number.

It is an amenable number.

1212000221 is a deficient number, since it is larger than the sum of its proper divisors (30031843).

1212000221 is an equidigital number, since it uses as much as digits as its factorization.

1212000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11251.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1212000221 is about 34813.7935450878. The cubic root of 1212000221 is about 1066.1890870620.

Adding to 1212000221 its reverse (1220002121), we get a palindrome (2432002342).

The spelling of 1212000221 in words is "one billion, two hundred twelve million, two hundred twenty-one", and thus it is an aban number.