1221030001 has 2 divisors, whose sum is σ = 1221030002. Its totient is φ = 1221030000.

The previous prime is 1221029993. The next prime is 1221030011. The reversal of 1221030001 is 1000301221.

It is an a-pointer prime, because the next prime (1221030011) can be obtained adding 1221030001 to its sum of digits (10).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1056575025 + 164454976 = 32505^2 + 12824^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221030001 - 2³ = 1221029993 is a prime.

It is a super-3 number, since 3×1221030001³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221030001.

It is not a weakly prime, because it can be changed into another prime (1221030011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610515000 + 610515001.

It is an arithmetic number, because the mean of its divisors is an integer number (610515001).

Almost surely, 2^1221030001 is an apocalyptic number.

It is an amenable number.

1221030001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221030001 is an equidigital number, since it uses as much as digits as its factorization.

1221030001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1221030001 is about 34943.2397038397. The cubic root of 1221030001 is about 1068.8303523094.

Adding to 1221030001 its reverse (1000301221), we get a palindrome (2221331222).

The spelling of 1221030001 in words is "one billion, two hundred twenty-one million, thirty thousand, one".