1001220010101 has 24 divisors (see below), whose sum is σ = 1549871331840. Its totient is φ = 621203479776.

The previous prime is 1001220010097. The next prime is 1001220010123. The reversal of 1001220010101 is 1010100221001.

It is a happy number.

It is not a de Polignac number, because 1001220010101 - 2² = 1001220010097 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 (1001220010001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65354661 + ... + 65369978.

It is an arithmetic number, because the mean of its divisors is an integer number (64577972160).

Almost surely, 2^{1001220010101} is an apocalyptic number.

It is an amenable number.

1001220010101 is a deficient number, since it is larger than the sum of its proper divisors (548651321739).

1001220010101 is a wasteful number, since it uses less digits than its factorization.

1001220010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130724705 (or 130724702 counting only the distinct ones).

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

Adding to 1001220010101 its reverse (1010100221001), we get a palindrome (2011320231102).

The spelling of 1001220010101 in words is "one trillion, one billion, two hundred twenty million, ten thousand, one hundred one".