1000021021101 has 6 divisors (see below), whose sum is σ = 1444474808270. Its totient is φ = 666680680728.

The previous prime is 1000021021093. The next prime is 1000021021117. The reversal of 1000021021101 is 1011201200001.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 715639862025 + 284381159076 = 845955^2 + 533274^2 .

It is not a de Polignac number, because 1000021021101 - 2³ = 1000021021093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 111113446789 = 1000021021101 / (1 + 0 + 0 + 0 + 0 + 2 + 1 + 0 + 2 + 1 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000021021151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55556723386 + ... + 55556723403.

Almost surely, 2^{1000021021101} is an apocalyptic number.

It is an amenable number.

1000021021101 is a deficient number, since it is larger than the sum of its proper divisors (444453787169).

1000021021101 is a wasteful number, since it uses less digits than its factorization.

1000021021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111113446795 (or 111113446792 counting only the distinct ones).

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

Adding to 1000021021101 its reverse (1011201200001), we get a palindrome (2011222221102).

The spelling of 1000021021101 in words is "one trillion, twenty-one million, twenty-one thousand, one hundred one".