1000111021 has 24 divisors (see below), whose sum is σ = 1255962624. Its totient is φ = 789354720.

The previous prime is 1000110997. The next prime is 1000111027. The reversal of 1000111021 is 1201110001.

It is not a de Polignac number, because 1000111021 - 2¹¹ = 1000108973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 1000110995 and 1000111013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000111027) 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, 293236 + ... + 296626.

It is an arithmetic number, because the mean of its divisors is an integer number (52331776).

Almost surely, 2^1000111021 is an apocalyptic number.

It is an amenable number.

1000111021 is a deficient number, since it is larger than the sum of its proper divisors (255851603).

1000111021 is a wasteful number, since it uses less digits than its factorization.

1000111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3881 (or 3874 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 1000111021 is about 31624.5319491056. The cubic root of 1000111021 is about 1000.0370056306.

Adding to 1000111021 its reverse (1201110001), we get a palindrome (2201221022).

The spelling of 1000111021 in words is "one billion, one hundred eleven thousand, twenty-one".