1000021111 has 4 divisors (see below), whose sum is σ = 1000105000. Its totient is φ = 999937224.

The previous prime is 1000021097. The next prime is 1000021133. The reversal of 1000021111 is 1111200001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1000021111 - 2⁵ = 1000021079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000021094 and 1000021103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000021511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20361 + ... + 49138.

It is an arithmetic number, because the mean of its divisors is an integer number (250026250).

Almost surely, 2^1000021111 is an apocalyptic number.

1000021111 is a deficient number, since it is larger than the sum of its proper divisors (83889).

1000021111 is an equidigital number, since it uses as much as digits as its factorization.

1000021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83888.

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

The square root of 1000021111 is about 31623.1103941405. The cubic root of 1000021111 is about 1000.0070369505.

Adding to 1000021111 its reverse (1111200001), we get a palindrome (2111221112).

The spelling of 1000021111 in words is "one billion, twenty-one thousand, one hundred eleven".