11111001002021 has 4 divisors (see below), whose sum is σ = 11112512504544. Its totient is φ = 11109489499500.

The previous prime is 11111001001963. The next prime is 11111001002041. The reversal of 11111001002021 is 12020010011111.

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 11111001002021 - 2¹⁸ = 11111000739877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111001001993 and 11111001002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111001002041) 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 3 ways as a sum of consecutive naturals, for example, 755740235 + ... + 755754936.

It is an arithmetic number, because the mean of its divisors is an integer number (2778128126136).

Almost surely, 2^{11111001002021} is an apocalyptic number.

It is an amenable number.

11111001002021 is a deficient number, since it is larger than the sum of its proper divisors (1511502523).

11111001002021 is an equidigital number, since it uses as much as digits as its factorization.

11111001002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511502522.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11111001002021 its reverse (12020010011111), we get a palindrome (23131011013132).

The spelling of 11111001002021 in words is "eleven trillion, one hundred eleven billion, one million, two thousand, twenty-one".