11111001021021 has 16 divisors (see below), whose sum is σ = 16505316799488. Its totient is φ = 6590664692400.

The previous prime is 11111001021011. The next prime is 11111001021049. The reversal of 11111001021021 is 12012010011111.

It is not a de Polignac number, because 11111001021021 - 2¹⁹ = 11111000496733 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11111001020988 and 11111001021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111001021011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3581881435 + ... + 3581884536.

It is an arithmetic number, because the mean of its divisors is an integer number (1031582299968).

Almost surely, 2^{11111001021021} is an apocalyptic number.

11111001021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11111001021021 is a deficient number, since it is larger than the sum of its proper divisors (5394315778467).

11111001021021 is a wasteful number, since it uses less digits than its factorization.

11111001021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7163766032.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 11111001021021 its reverse (12012010011111), we get a palindrome (23123011032132).

The spelling of 11111001021021 in words is "eleven trillion, one hundred eleven billion, one million, twenty-one thousand, twenty-one".