1213200221 has 4 divisors (see below), whose sum is σ = 1252335744. Its totient is φ = 1174064700.

The previous prime is 1213200199. The next prime is 1213200259. The reversal of 1213200221 is 1220023121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1220023121 = 29567 ⋅41263.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213200221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1213200196 and 1213200205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213200271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19567715 + ... + 19567776.

It is an arithmetic number, because the mean of its divisors is an integer number (313083936).

Almost surely, 2^1213200221 is an apocalyptic number.

It is an amenable number.

1213200221 is a deficient number, since it is larger than the sum of its proper divisors (39135523).

1213200221 is an equidigital number, since it uses as much as digits as its factorization.

1213200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39135522.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1213200221 is about 34831.0238293393. The cubic root of 1213200221 is about 1066.5408485170.

Adding to 1213200221 its reverse (1220023121), we get a palindrome (2433223342).

The spelling of 1213200221 in words is "one billion, two hundred thirteen million, two hundred thousand, two hundred twenty-one".