1001221210101 has 32 divisors (see below), whose sum is σ = 1541454520320. Its totient is φ = 566219553984.

The previous prime is 1001221210091. The next prime is 1001221210109. The reversal of 1001221210101 is 1010121221001.

It is not a de Polignac number, because 1001221210101 - 2⁵ = 1001221210069 is a prime.

It is a super-2 number, since 2×1001221210101² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001221210109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1721986 + ... + 2228828.

It is an arithmetic number, because the mean of its divisors is an integer number (48170453760).

Almost surely, 2^{1001221210101} is an apocalyptic number.

It is an amenable number.

1001221210101 is a deficient number, since it is larger than the sum of its proper divisors (540233310219).

1001221210101 is a wasteful number, since it uses less digits than its factorization.

1001221210101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507825.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1001221210101 its reverse (1010121221001), we get a palindrome (2011342431102).

The spelling of 1001221210101 in words is "one trillion, one billion, two hundred twenty-one million, two hundred ten thousand, one hundred one".