1000021011 has 16 divisors (see below), whose sum is σ = 1455107328. Its totient is φ = 605852000.

The previous prime is 1000021003. The next prime is 1000021019. The reversal of 1000021011 is 1101200001.

It is an interprime number because it is at equal distance from previous prime (1000021003) and next prime (1000021019).

It is a cyclic number.

It is not a de Polignac number, because 1000021011 - 2³ = 1000021003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1000021019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160861 + ... + 166961.

It is an arithmetic number, because the mean of its divisors is an integer number (90944208).

Almost surely, 2^1000021011 is an apocalyptic number.

1000021011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1000021011 is a deficient number, since it is larger than the sum of its proper divisors (455086317).

1000021011 is a wasteful number, since it uses less digits than its factorization.

1000021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11082.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 1000021011 is about 31623.1088130184. The cubic root of 1000021011 is about 1000.0070036176.

Adding to 1000021011 its reverse (1101200001), we get a palindrome (2101221012).

The spelling of 1000021011 in words is "one billion, twenty-one thousand, eleven".