1212001221 has 8 divisors (see below), whose sum is σ = 1626295264. Its totient is φ = 802854000.

The previous prime is 1212001211. The next prime is 1212001223. The reversal of 1212001221 is 1221002121.

1212001221 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1212001221 - 2⁶ = 1212001157 is a prime.

It is a Duffinian number.

1212001221 is a modest number, since divided by 1221 gives 1212 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1212001197 and 1212001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212001223) 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, 1286155 + ... + 1287096.

It is an arithmetic number, because the mean of its divisors is an integer number (203286908).

Almost surely, 2^1212001221 is an apocalyptic number.

It is an amenable number.

1212001221 is a deficient number, since it is larger than the sum of its proper divisors (414294043).

1212001221 is a wasteful number, since it uses less digits than its factorization.

1212001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573411.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1212001221 is about 34813.8079072083. The cubic root of 1212001221 is about 1066.1893802932.

Adding to 1212001221 its reverse (1221002121), we get a palindrome (2433003342).

The spelling of 1212001221 in words is "one billion, two hundred twelve million, one thousand, two hundred twenty-one".