1220010101 has 4 divisors (see below), whose sum is σ = 1224174252. Its totient is φ = 1215845952.

The previous prime is 1220010073. The next prime is 1220010107. The reversal of 1220010101 is 1010100221.

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 496131076 + 723879025 = 22274^2 + 26905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220010101 is a prime.

It is a Duffinian number.

1220010101 is a modest number, since divided by 10101 gives 1220 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220010107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2081636 + ... + 2082221.

It is an arithmetic number, because the mean of its divisors is an integer number (306043563).

Almost surely, 2^1220010101 is an apocalyptic number.

It is an amenable number.

1220010101 is a deficient number, since it is larger than the sum of its proper divisors (4164151).

1220010101 is an equidigital number, since it uses as much as digits as its factorization.

1220010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4164150.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1220010101 is about 34928.6429882410. The cubic root of 1220010101 is about 1068.5326791076.

Adding to 1220010101 its reverse (1010100221), we get a palindrome (2230110322).

The spelling of 1220010101 in words is "one billion, two hundred twenty million, ten thousand, one hundred one".