1202221001 has 4 divisors (see below), whose sum is σ = 1221929604. Its totient is φ = 1182512400.

The previous prime is 1202220997. The next prime is 1202221019. The reversal of 1202221001 is 1001222021.

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 511845376 + 690375625 = 22624^2 + 26275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202221001 - 2² = 1202220997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1202221021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9854210 + ... + 9854331.

It is an arithmetic number, because the mean of its divisors is an integer number (305482401).

Almost surely, 2^1202221001 is an apocalyptic number.

It is an amenable number.

1202221001 is a deficient number, since it is larger than the sum of its proper divisors (19708603).

1202221001 is an equidigital number, since it uses as much as digits as its factorization.

1202221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19708602.

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

The square root of 1202221001 is about 34673.0587199918. The cubic root of 1202221001 is about 1063.3137667238.

Adding to 1202221001 its reverse (1001222021), we get a palindrome (2203443022).

The spelling of 1202221001 in words is "one billion, two hundred two million, two hundred twenty-one thousand, one".