1201220101 has 4 divisors (see below), whose sum is σ = 1201392972. Its totient is φ = 1201047232.

The previous prime is 1201220087. The next prime is 1201220129. The reversal of 1201220101 is 1010221021.

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 1024064001 + 177156100 = 32001^2 + 13310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201220101 - 2²¹ = 1199122949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201220131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75556 + ... + 90061.

It is an arithmetic number, because the mean of its divisors is an integer number (300348243).

Almost surely, 2^1201220101 is an apocalyptic number.

It is an amenable number.

1201220101 is a deficient number, since it is larger than the sum of its proper divisors (172871).

1201220101 is an equidigital number, since it uses as much as digits as its factorization.

1201220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172870.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1201220101 is about 34658.6223182630. The cubic root of 1201220101 is about 1063.0186001848.

Adding to 1201220101 its reverse (1010221021), we get a palindrome (2211441122).

It can be divided in two parts, 120 and 1220101, that added together give a palindrome (1220221).

The spelling of 1201220101 in words is "one billion, two hundred one million, two hundred twenty thousand, one hundred one".