1220200101 has 12 divisors (see below), whose sum is σ = 1763550828. Its totient is φ = 812986944.

The previous prime is 1220200099. The next prime is 1220200127. The reversal of 1220200101 is 1010020221.

It can be written as a sum of positive squares in 2 ways, for example, as 200930625 + 1019269476 = 14175^2 + 31926^2 .

It is not a de Polignac number, because 1220200101 - 2¹ = 1220200099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220200801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23520 + ... + 54713.

It is an arithmetic number, because the mean of its divisors is an integer number (146962569).

Almost surely, 2^1220200101 is an apocalyptic number.

It is an amenable number.

1220200101 is a deficient number, since it is larger than the sum of its proper divisors (543350727).

1220200101 is a wasteful number, since it uses less digits than its factorization.

1220200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79972 (or 79969 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1220200101 is about 34931.3627131837. The cubic root of 1220200101 is about 1068.5881460447.

Adding to 1220200101 its reverse (1010020221), we get a palindrome (2230220322).

The spelling of 1220200101 in words is "one billion, two hundred twenty million, two hundred thousand, one hundred one".