11000021221 has 24 divisors (see below), whose sum is σ = 13124985984. Its totient is φ = 9187194240.

The previous prime is 11000021209. The next prime is 11000021243. The reversal of 11000021221 is 12212000011.

It is not a de Polignac number, because 11000021221 - 2⁷ = 11000021093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11000021198 and 11000021207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11000021281) 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, 902061 + ... + 914173.

It is an arithmetic number, because the mean of its divisors is an integer number (546874416).

Almost surely, 2^11000021221 is an apocalyptic number.

It is an amenable number.

11000021221 is a deficient number, since it is larger than the sum of its proper divisors (2124964763).

11000021221 is a wasteful number, since it uses less digits than its factorization.

11000021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12601 (or 12594 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 11000021221 its reverse (12212000011), we get a palindrome (23212021232).

The spelling of 11000021221 in words is "eleven billion, twenty-one thousand, two hundred twenty-one".