21110121201 has 32 divisors (see below), whose sum is σ = 30657537792. Its totient is φ = 12843129600.

The previous prime is 21110121191. The next prime is 21110121259. The reversal of 21110121201 is 10212101112.

It is not a de Polignac number, because 21110121201 - 2²⁵ = 21076566769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21110121001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2923071 + ... + 2930283.

It is an arithmetic number, because the mean of its divisors is an integer number (958048056).

Almost surely, 2^21110121201 is an apocalyptic number.

It is an amenable number.

21110121201 is a deficient number, since it is larger than the sum of its proper divisors (9547416591).

21110121201 is a wasteful number, since it uses less digits than its factorization.

21110121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8073.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21110121201 its reverse (10212101112), we get a palindrome (31322222313).

It can be divided in two parts, 21110 and 121201, that added together give a triangular number (142311 = T₅₃₃).

The spelling of 21110121201 in words is "twenty-one billion, one hundred ten million, one hundred twenty-one thousand, two hundred one".