1212221441 has 4 divisors (see below), whose sum is σ = 1216830912. Its totient is φ = 1207611972.

The previous prime is 1212221401. The next prime is 1212221447. The reversal of 1212221441 is 1441222121.

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: 1441222121 = 33073 ⋅43577.

It is a cyclic number.

It is not a de Polignac number, because 1212221441 - 2⁶ = 1212221377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212221447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2304341 + ... + 2304866.

It is an arithmetic number, because the mean of its divisors is an integer number (304207728).

Almost surely, 2^1212221441 is an apocalyptic number.

It is an amenable number.

1212221441 is a deficient number, since it is larger than the sum of its proper divisors (4609471).

1212221441 is an equidigital number, since it uses as much as digits as its factorization.

1212221441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4609470.

The product of its digits is 256, while the sum is 20.

The square root of 1212221441 is about 34816.9705890676. The cubic root of 1212221441 is about 1066.2539517369.

Adding to 1212221441 its reverse (1441222121), we get a palindrome (2653443562).

The spelling of 1212221441 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, four hundred forty-one".