11021001220021 has 16 divisors (see below), whose sum is σ = 12576086765424. Its totient is φ = 9567832587264.

The previous prime is 11021001220013. The next prime is 11021001220193. The reversal of 11021001220021 is 12002210012011.

It can be written as a sum of positive squares in 8 ways, for example, as 3523185310225 + 7497815909796 = 1877015^2 + 2738214^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021001220021 - 2³ = 11021001220013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 11021001219983 and 11021001220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021001220721) 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 15 ways as a sum of consecutive naturals, for example, 17857086 + ... + 18463951.

It is an arithmetic number, because the mean of its divisors is an integer number (786005422839).

Almost surely, 2^{11021001220021} is an apocalyptic number.

It is an amenable number.

11021001220021 is a deficient number, since it is larger than the sum of its proper divisors (1555085545403).

11021001220021 is a wasteful number, since it uses less digits than its factorization.

11021001220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36322440.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11021001220021 its reverse (12002210012011), we get a palindrome (23023211232032).

The spelling of 11021001220021 in words is "eleven trillion, twenty-one billion, one million, two hundred twenty thousand, twenty-one".