10011121221 has 16 divisors (see below), whose sum is σ = 13400256320. Its totient is φ = 6648082560.

The previous prime is 10011121207. The next prime is 10011121229. The reversal of 10011121221 is 12212111001.

It is not a de Polignac number, because 10011121221 - 2⁹ = 10011120709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10011121197 and 10011121206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011121229) 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, 893826 + ... + 904956.

It is an arithmetic number, because the mean of its divisors is an integer number (837516020).

Almost surely, 2^10011121221 is an apocalyptic number.

It is an amenable number.

10011121221 is a deficient number, since it is larger than the sum of its proper divisors (3389135099).

10011121221 is a wasteful number, since it uses less digits than its factorization.

10011121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12276.

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

Adding to 10011121221 its reverse (12212111001), we get a palindrome (22223232222).

The spelling of 10011121221 in words is "ten billion, eleven million, one hundred twenty-one thousand, two hundred twenty-one".