1101220101 has 12 divisors (see below), whose sum is σ = 1684219212. Its totient is φ = 690961536.

The previous prime is 1101220097. The next prime is 1101220117. The reversal of 1101220101 is 1010221011.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 582063876 + 519156225 = 24126^2 + 22785^2 .

It is not a de Polignac number, because 1101220101 - 2² = 1101220097 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 (1101220121) 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 11 ways as a sum of consecutive naturals, for example, 3598606 + ... + 3598911.

It is an arithmetic number, because the mean of its divisors is an integer number (140351601).

Almost surely, 2^1101220101 is an apocalyptic number.

It is an amenable number.

1101220101 is a deficient number, since it is larger than the sum of its proper divisors (582999111).

1101220101 is a wasteful number, since it uses less digits than its factorization.

1101220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7197540 (or 7197537 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1101220101 is about 33184.6365205346. The cubic root of 1101220101 is about 1032.6616368567.

Adding to 1101220101 its reverse (1010221011), we get a palindrome (2111441112).

It can be divided in two parts, 11012 and 20101, that added together give a palindrome (31113).

The spelling of 1101220101 in words is "one billion, one hundred one million, two hundred twenty thousand, one hundred one".