11001111212021 has 4 divisors (see below), whose sum is σ = 12572698528032. Its totient is φ = 9429523896012.

The previous prime is 11001111212009. The next prime is 11001111212029. The reversal of 11001111212021 is 12021211110011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11001111212021 - 2⁶ = 11001111211957 is a prime.

It is a super-2 number, since 2×11001111212021² (a number of 27 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 = 11001111211987 and 11001111212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001111212029) 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 3 ways as a sum of consecutive naturals, for example, 785793657995 + ... + 785793658008.

It is an arithmetic number, because the mean of its divisors is an integer number (3143174632008).

Almost surely, 2^{11001111212021} is an apocalyptic number.

It is an amenable number.

11001111212021 is a deficient number, since it is larger than the sum of its proper divisors (1571587316011).

11001111212021 is an equidigital number, since it uses as much as digits as its factorization.

11001111212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571587316010.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 11001111212021 its reverse (12021211110011), we get a palindrome (23022322322032).

It can be divided in two parts, 1100111 and 1212021, that added together give a palindrome (2312132).

The spelling of 11001111212021 in words is "eleven trillion, one billion, one hundred eleven million, two hundred twelve thousand, twenty-one".