21110001210001 has 16 divisors (see below), whose sum is σ = 23198582139840. Its totient is φ = 19049685441280.

The previous prime is 21110001209987. The next prime is 21110001210007. The reversal of 21110001210001 is 10001210001112.

It is a cyclic number.

It is not a de Polignac number, because 21110001210001 - 2⁷ = 21110001209873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110001210001.

It is not an unprimeable number, because it can be changed into a prime (21110001210007) 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, 25174845 + ... + 25999861.

It is an arithmetic number, because the mean of its divisors is an integer number (1449911383740).

Almost surely, 2^{21110001210001} is an apocalyptic number.

It is an amenable number.

21110001210001 is a deficient number, since it is larger than the sum of its proper divisors (2088580929839).

21110001210001 is a wasteful number, since it uses less digits than its factorization.

21110001210001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842144.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21110001210001 its reverse (10001210001112), we get a palindrome (31111211211113).

The spelling of 21110001210001 in words is "twenty-one trillion, one hundred ten billion, one million, two hundred ten thousand, one".