11220121021 has 16 divisors (see below), whose sum is σ = 11542417920. Its totient is φ = 10900799280.

The previous prime is 11220121001. The next prime is 11220121051. The reversal of 11220121021 is 12012102211.

It is a de Polignac number, because none of the positive numbers 2^k-11220121021 is a prime.

It is a super-2 number, since 2×11220121021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11220120992 and 11220121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220121001) 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, 8690386 + ... + 8691676.

It is an arithmetic number, because the mean of its divisors is an integer number (721401120).

Almost surely, 2^11220121021 is an apocalyptic number.

It is an amenable number.

11220121021 is a deficient number, since it is larger than the sum of its proper divisors (322296899).

11220121021 is a wasteful number, since it uses less digits than its factorization.

11220121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256.

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

Adding to 11220121021 its reverse (12012102211), we get a palindrome (23232223232).

The spelling of 11220121021 in words is "eleven billion, two hundred twenty million, one hundred twenty-one thousand, twenty-one".