1100002100021 has 8 divisors (see below), whose sum is σ = 1200023364288. Its totient is φ = 999984348000.

The previous prime is 1100002099993. The next prime is 1100002100023. The reversal of 1100002100021 is 1200012000011.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1100002100021 - 2³⁰ = 1098928358197 is a prime.

It is a super-2 number, since 2×1100002100021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100002099981 and 1100002100008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100002100023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200465 + ... + 1496726.

It is an arithmetic number, because the mean of its divisors is an integer number (150002920536).

Almost surely, 2^{1100002100021} is an apocalyptic number.

1100002100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1100002100021 is a deficient number, since it is larger than the sum of its proper divisors (100021264267).

1100002100021 is a wasteful number, since it uses less digits than its factorization.

1100002100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756123.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 1100002100021 its reverse (1200012000011), we get a palindrome (2300014100032).

The spelling of 1100002100021 in words is "one trillion, one hundred billion, two million, one hundred thousand, twenty-one".