1212201221 has 8 divisors (see below), whose sum is σ = 1511315904. Its totient is φ = 944572320.

The previous prime is 1212201217. The next prime is 1212201227. The reversal of 1212201221 is 1221022121.

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 1212201221 - 2² = 1212201217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212201196 and 1212201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212201227) 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, 7871360 + ... + 7871513.

It is an arithmetic number, because the mean of its divisors is an integer number (188914488).

Almost surely, 2^1212201221 is an apocalyptic number.

1212201221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212201221 is a deficient number, since it is larger than the sum of its proper divisors (299114683).

1212201221 is a wasteful number, since it uses less digits than its factorization.

1212201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15742891.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1212201221 is about 34816.6802122201. The cubic root of 1212201221 is about 1066.2480232891.

Adding to 1212201221 its reverse (1221022121), we get a palindrome (2433223342).

Subtracting 1212201221 from its reverse (1221022121), we obtain a square (8820900 = 2970²).

The spelling of 1212201221 in words is "one billion, two hundred twelve million, two hundred one thousand, two hundred twenty-one".