11011012221 has 24 divisors (see below), whose sum is σ = 16986696160. Its totient is φ = 6322108320.

The previous prime is 11011012219. The next prime is 11011012253. The reversal of 11011012221 is 12221011011.

It is not a de Polignac number, because 11011012221 - 2¹ = 11011012219 is a prime.

It is a super-2 number, since 2×11011012221² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11011012197 and 11011012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011012921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 791350 + ... + 805143.

Almost surely, 2^11011012221 is an apocalyptic number.

11011012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11011012221 is a deficient number, since it is larger than the sum of its proper divisors (5975683939).

11011012221 is a wasteful number, since it uses less digits than its factorization.

11011012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596537 (or 1596526 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11011012221 its reverse (12221011011), we get a palindrome (23232023232).

The spelling of 11011012221 in words is "eleven billion, eleven million, twelve thousand, two hundred twenty-one".