1111110021 has 32 divisors (see below), whose sum is σ = 1991911680. Its totient is φ = 597570048.

The previous prime is 1111110019. The next prime is 1111110053. The reversal of 1111110021 is 1200111111.

It is not a de Polignac number, because 1111110021 - 2¹ = 1111110019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1111109985 and 1111110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111110001) 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, 169696 + ... + 176121.

It is an arithmetic number, because the mean of its divisors is an integer number (62247240).

Almost surely, 2^1111110021 is an apocalyptic number.

It is an amenable number.

1111110021 is a deficient number, since it is larger than the sum of its proper divisors (880801659).

1111110021 is a wasteful number, since it uses less digits than its factorization.

1111110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345850 (or 345844 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

The square root of 1111110021 is about 33333.3169816627. The cubic root of 1111110021 is about 1035.7438299283.

Adding to 1111110021 its reverse (1200111111), we get a palindrome (2311221132).

The spelling of 1111110021 in words is "one billion, one hundred eleven million, one hundred ten thousand, twenty-one".