21110001222001 has 16 divisors (see below), whose sum is σ = 22220533592064. Its totient is φ = 20015803551744.

The previous prime is 21110001221987. The next prime is 21110001222007. The reversal of 21110001222001 is 10022210001112.

It is a cyclic number.

It is not a de Polignac number, because 21110001222001 - 2²¹ = 21109999124849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110001222007) 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, 233925 + ... + 6501901.

It is an arithmetic number, because the mean of its divisors is an integer number (1388783349504).

Almost surely, 2^{21110001222001} is an apocalyptic number.

It is an amenable number.

21110001222001 is a deficient number, since it is larger than the sum of its proper divisors (1110532370063).

21110001222001 is a wasteful number, since it uses less digits than its factorization.

21110001222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6269280.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21110001222001 its reverse (10022210001112), we get a palindrome (31132211223113).

The spelling of 21110001222001 in words is "twenty-one trillion, one hundred ten billion, one million, two hundred twenty-two thousand, one".