21001010011 has 16 divisors (see below), whose sum is σ = 22002775200. Its totient is φ = 20018107648.

The previous prime is 21001009999. The next prime is 21001010029. The reversal of 21001010011 is 11001010012.

It is a cyclic number.

It is not a de Polignac number, because 21001010011 - 2³³ = 12411075419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001009976 and 21001010003.

It is not an unprimeable number, because it can be changed into a prime (21001010071) 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, 4977975 + ... + 4982191.

It is an arithmetic number, because the mean of its divisors is an integer number (1375173450).

Almost surely, 2^21001010011 is an apocalyptic number.

21001010011 is a deficient number, since it is larger than the sum of its proper divisors (1001765189).

21001010011 is a wasteful number, since it uses less digits than its factorization.

21001010011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6398.

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

Adding to 21001010011 its reverse (11001010012), we get a palindrome (32002020023).

Subtracting from 21001010011 its reverse (11001010012), we obtain a palindrome (9999999999).

The spelling of 21001010011 in words is "twenty-one billion, one million, ten thousand, eleven".