10012111221 has 32 divisors (see below), whose sum is σ = 15800721408. Its totient is φ = 5520574080.

The previous prime is 10012111211. The next prime is 10012111247. The reversal of 10012111221 is 12211121001.

It is not a de Polignac number, because 10012111221 - 2⁷ = 10012111093 is a prime.

It is a super-2 number, since 2×10012111221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10012111197 and 10012111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10012111201) 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, 1360 + ... + 141513.

It is an arithmetic number, because the mean of its divisors is an integer number (493772544).

Almost surely, 2^10012111221 is an apocalyptic number.

It is an amenable number.

10012111221 is a deficient number, since it is larger than the sum of its proper divisors (5788610187).

10012111221 is a wasteful number, since it uses less digits than its factorization.

10012111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143001.

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

Adding to 10012111221 its reverse (12211121001), we get a palindrome (22223232222).

The spelling of 10012111221 in words is "ten billion, twelve million, one hundred eleven thousand, two hundred twenty-one".