11021020121 has 8 divisors (see below), whose sum is σ = 11206173384. Its totient is φ = 10836011520.

The previous prime is 11021020097. The next prime is 11021020123. The reversal of 11021020121 is 12102012011.

It can be written as a sum of positive squares in 4 ways, for example, as 476810896 + 10544209225 = 21836^2 + 102685^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11021020121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11021020123) 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 7 ways as a sum of consecutive naturals, for example, 123335 + ... + 193011.

It is an arithmetic number, because the mean of its divisors is an integer number (1400771673).

Almost surely, 2^11021020121 is an apocalyptic number.

It is an amenable number.

11021020121 is a deficient number, since it is larger than the sum of its proper divisors (185153263).

11021020121 is an equidigital number, since it uses as much as digits as its factorization.

11021020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72331.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11021020121 its reverse (12102012011), we get a palindrome (23123032132).

The spelling of 11021020121 in words is "eleven billion, twenty-one million, twenty thousand, one hundred twenty-one".