21111112228 has 6 divisors (see below), whose sum is σ = 36944446406. Its totient is φ = 10555556112.

The previous prime is 21111112207. The next prime is 21111112229. The reversal of 21111112228 is 82221111112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19546276864 + 1564835364 = 139808^2 + 39558^2 .

It is a super-2 number, since 2×21111112228² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21111112199 and 21111112208.

It is not an unprimeable number, because it can be changed into a prime (21111112229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638889025 + ... + 2638889032.

Almost surely, 2^21111112228 is an apocalyptic number.

It is an amenable number.

21111112228 is a deficient number, since it is larger than the sum of its proper divisors (15833334178).

21111112228 is a wasteful number, since it uses less digits than its factorization.

21111112228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277778061 (or 5277778059 counting only the distinct ones).

The product of its digits is 128, while the sum is 22.

The spelling of 21111112228 in words is "twenty-one billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty-eight".