11000031021 has 36 divisors (see below), whose sum is σ = 18717067200. Its totient is φ = 6206146128.

The previous prime is 11000031017. The next prime is 11000031023. The reversal of 11000031021 is 12013000011.

It is not a de Polignac number, because 11000031021 - 2² = 11000031017 is a prime.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11000030994 and 11000031012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11000031023) 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 35 ways as a sum of consecutive naturals, for example, 123031 + ... + 192708.

Almost surely, 2^11000031021 is an apocalyptic number.

It is an amenable number.

11000031021 is a deficient number, since it is larger than the sum of its proper divisors (7717036179).

11000031021 is a wasteful number, since it uses less digits than its factorization.

11000031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315838 (or 315828 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 11000031021 its reverse (12013000011), we get a palindrome (23013031032).

The spelling of 11000031021 in words is "eleven billion, thirty-one thousand, twenty-one".