1220020101 has 12 divisors (see below), whose sum is σ = 1763667360. Its totient is φ = 812693160.

The previous prime is 1220020093. The next prime is 1220020121. The reversal of 1220020101 is 1010200221.

It is not a de Polignac number, because 1220020101 - 2³ = 1220020093 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 (1220020121) 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, 42505 + ... + 65166.

It is an arithmetic number, because the mean of its divisors is an integer number (146972280).

Almost surely, 2^1220020101 is an apocalyptic number.

It is an amenable number.

1220020101 is a deficient number, since it is larger than the sum of its proper divisors (543647259).

1220020101 is a wasteful number, since it uses less digits than its factorization.

1220020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108936 (or 108933 counting only the distinct ones).

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

The square root of 1220020101 is about 34928.7861369387. The cubic root of 1220020101 is about 1068.5355985637.

Adding to 1220020101 its reverse (1010200221), we get a palindrome (2230220322).

The spelling of 1220020101 in words is "one billion, two hundred twenty million, twenty thousand, one hundred one".