21002040011 has 8 divisors (see below), whose sum is σ = 21573366384. Its totient is φ = 20430908640.

The previous prime is 21002039987. The next prime is 21002040043. The reversal of 21002040011 is 11004020012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21002040011 - 2²² = 20997845707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21002039974 and 21002040001.

It is not an unprimeable number, because it can be changed into a prime (21002042011) 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 7 ways as a sum of consecutive naturals, for example, 184556 + ... + 275798.

It is an arithmetic number, because the mean of its divisors is an integer number (2696670798).

Almost surely, 2^21002040011 is an apocalyptic number.

21002040011 is a deficient number, since it is larger than the sum of its proper divisors (571326373).

21002040011 is an equidigital number, since it uses as much as digits as its factorization.

21002040011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97501.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21002040011 its reverse (11004020012), we get a palindrome (32006060023).

The spelling of 21002040011 in words is "twenty-one billion, two million, forty thousand, eleven".