1212221447 has 2 divisors, whose sum is σ = 1212221448. Its totient is φ = 1212221446.

The previous prime is 1212221401. The next prime is 1212221453. The reversal of 1212221447 is 7441222121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7441222121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212221447 - 2⁸ = 1212221191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212221467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606110723 + 606110724.

It is an arithmetic number, because the mean of its divisors is an integer number (606110724).

Almost surely, 2^1212221447 is an apocalyptic number.

1212221447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212221447 is an equidigital number, since it uses as much as digits as its factorization.

1212221447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 26.

The square root of 1212221447 is about 34816.9706752325. The cubic root of 1212221447 is about 1066.2539534961.

Adding to 1212221447 its reverse (7441222121), we get a palindrome (8653443568).

The spelling of 1212221447 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, four hundred forty-seven".