1212222001 has 2 divisors, whose sum is σ = 1212222002. Its totient is φ = 1212222000.

The previous prime is 1212221981. The next prime is 1212222019. The reversal of 1212222001 is 1002222121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 979690000 + 232532001 = 31300^2 + 15249^2 .

It is an emirp because it is prime and its reverse (1002222121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212222001 - 2¹³ = 1212213809 is a prime.

It is not a weakly prime, because it can be changed into another prime (1212222041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606111000 + 606111001.

It is an arithmetic number, because the mean of its divisors is an integer number (606111001).

Almost surely, 2^1212222001 is an apocalyptic number.

It is an amenable number.

1212222001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212222001 is an equidigital number, since it uses as much as digits as its factorization.

1212222001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1212222001 is about 34816.9786311219. The cubic root of 1212222001 is about 1066.2541159264.

Adding to 1212222001 its reverse (1002222121), we get a palindrome (2214444122).

The spelling of 1212222001 in words is "one billion, two hundred twelve million, two hundred twenty-two thousand, one".