21011110001 has 16 divisors (see below), whose sum is σ = 24077700096. Its totient is φ = 17960844096.

The previous prime is 21011109979. The next prime is 21011110007. The reversal of 21011110001 is 10001111012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21011110001 - 2²⁶ = 20944001137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011110007) 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, 4722560 + ... + 4727006.

It is an arithmetic number, because the mean of its divisors is an integer number (1504856256).

Almost surely, 2^21011110001 is an apocalyptic number.

It is an amenable number.

21011110001 is a deficient number, since it is larger than the sum of its proper divisors (3066590095).

21011110001 is an equidigital number, since it uses as much as digits as its factorization.

21011110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6128.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21011110001 its reverse (10001111012), we get a palindrome (31012221013).

The spelling of 21011110001 in words is "twenty-one billion, eleven million, one hundred ten thousand, one".