1210222001 has 4 divisors (see below), whose sum is σ = 1210500900. Its totient is φ = 1209943104.

The previous prime is 1210221973. The next prime is 1210222007. The reversal of 1210222001 is 1002220121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 129390625 + 1080831376 = 11375^2 + 32876^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210222001 - 2¹⁸ = 1209959857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210222007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132836 + ... + 141653.

It is an arithmetic number, because the mean of its divisors is an integer number (302625225).

Almost surely, 2^1210222001 is an apocalyptic number.

It is an amenable number.

1210222001 is a deficient number, since it is larger than the sum of its proper divisors (278899).

1210222001 is an equidigital number, since it uses as much as digits as its factorization.

1210222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278898.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1210222001 is about 34788.2451555119. The cubic root of 1210222001 is about 1065.6674021374.

Adding to 1210222001 its reverse (1002220121), we get a palindrome (2212442122).

The spelling of 1210222001 in words is "one billion, two hundred ten million, two hundred twenty-two thousand, one".