11111220001021 has 16 divisors (see below), whose sum is σ = 12703999246848. Its totient is φ = 9519807063600.

The previous prime is 11111220001003. The next prime is 11111220001127. The reversal of 11111220001021 is 12010002211111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11111220001021 - 2¹¹ = 11111219998973 is a prime.

It is a super-2 number, since 2×11111220001021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11111220000992 and 11111220001010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111220004021) 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, 210083046 + ... + 210135928.

It is an arithmetic number, because the mean of its divisors is an integer number (793999952928).

Almost surely, 2^{11111220001021} is an apocalyptic number.

It is an amenable number.

11111220001021 is a deficient number, since it is larger than the sum of its proper divisors (1592779245827).

11111220001021 is an equidigital number, since it uses as much as digits as its factorization.

11111220001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65232.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11111220001021 its reverse (12010002211111), we get a palindrome (23121222212132).

The spelling of 11111220001021 in words is "eleven trillion, one hundred eleven billion, two hundred twenty million, one thousand, twenty-one".