10001111100021 has 8 divisors (see below), whose sum is σ = 14816460888960. Its totient is φ = 6667407399996.

The previous prime is 10001111100011. The next prime is 10001111100047. The reversal of 10001111100021 is 12000111110001.

It is not a de Polignac number, because 10001111100021 - 2⁹ = 10001111099509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 10001111099976 and 10001111100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001111100011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185205761085 + ... + 185205761138.

It is an arithmetic number, because the mean of its divisors is an integer number (1852057611120).

Almost surely, 2^{10001111100021} is an apocalyptic number.

It is an amenable number.

10001111100021 is a deficient number, since it is larger than the sum of its proper divisors (4815349788939).

10001111100021 is an equidigital number, since it uses as much as digits as its factorization.

10001111100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370411522232 (or 370411522226 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 10001111100021 its reverse (12000111110001), we get a palindrome (22001222210022).

The spelling of 10001111100021 in words is "ten trillion, one billion, one hundred eleven million, one hundred thousand, twenty-one".