2221111021021 has 4 divisors (see below), whose sum is σ = 2221133354044. Its totient is φ = 2221088688000.

The previous prime is 2221111021009. The next prime is 2221111021043. The reversal of 2221111021021 is 1201201111222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2153817472921 + 67293548100 = 1467589^2 + 259410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221111021021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221111020986 and 2221111021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221111021321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11016660 + ... + 11216461.

It is an arithmetic number, because the mean of its divisors is an integer number (555283338511).

Almost surely, 2^{2221111021021} is an apocalyptic number.

It is an amenable number.

2221111021021 is a deficient number, since it is larger than the sum of its proper divisors (22333023).

2221111021021 is an equidigital number, since it uses as much as digits as its factorization.

2221111021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22333022.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2221111021021 its reverse (1201201111222), we get a palindrome (3422312132243).

The spelling of 2221111021021 in words is "two trillion, two hundred twenty-one billion, one hundred eleven million, twenty-one thousand, twenty-one".