11221021021 has 8 divisors (see below), whose sum is σ = 13085739200. Its totient is φ = 9618017724.

The previous prime is 11221021001. The next prime is 11221021061. The reversal of 11221021021 is 12012012211.

It is not a de Polignac number, because 11221021021 - 2¹¹ = 11221018973 is a prime.

It is a super-2 number, since 2×11221021021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

11221021021 is a modest number, since divided by 21021 gives 11221 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 11221020992 and 11221021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221021001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16356831 + ... + 16357516.

It is an arithmetic number, because the mean of its divisors is an integer number (1635717400).

Almost surely, 2^11221021021 is an apocalyptic number.

It is an amenable number.

11221021021 is a deficient number, since it is larger than the sum of its proper divisors (1864718179).

11221021021 is an frugal number, since it uses more digits than its factorization.

11221021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32714368 (or 32714354 counting only the distinct ones).

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

Adding to 11221021021 its reverse (12012012211), we get a palindrome (23233033232).

The spelling of 11221021021 in words is "eleven billion, two hundred twenty-one million, twenty-one thousand, twenty-one".