11020021221 has 32 divisors (see below), whose sum is σ = 16205857920. Its totient is φ = 6605312000.

The previous prime is 11020021213. The next prime is 11020021241. The reversal of 11020021221 is 12212002011.

It is a cyclic number.

It is not a de Polignac number, because 11020021221 - 2³ = 11020021213 is a prime.

It is a super-2 number, since 2×11020021221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11020021197 and 11020021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11020021241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5175085 + ... + 5177213.

It is an arithmetic number, because the mean of its divisors is an integer number (506433060).

Almost surely, 2^11020021221 is an apocalyptic number.

11020021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11020021221 is a deficient number, since it is larger than the sum of its proper divisors (5185836699).

11020021221 is a wasteful number, since it uses less digits than its factorization.

11020021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 11020021221 its reverse (12212002011), we get a palindrome (23232023232).

The spelling of 11020021221 in words is "eleven billion, twenty million, twenty-one thousand, two hundred twenty-one".