21110201001 has 48 divisors (see below), whose sum is σ = 32113635840. Its totient is φ = 13346000640.

The previous prime is 21110200967. The next prime is 21110201017. The reversal of 21110201001 is 10010201112.

It is a happy number.

It is not a de Polignac number, because 21110201001 - 2⁷ = 21110200873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21110201201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8146216 + ... + 8148806.

It is an arithmetic number, because the mean of its divisors is an integer number (669034080).

Almost surely, 2^21110201001 is an apocalyptic number.

It is an amenable number.

21110201001 is a deficient number, since it is larger than the sum of its proper divisors (11003434839).

21110201001 is a wasteful number, since it uses less digits than its factorization.

21110201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246 (or 3243 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21110201001 its reverse (10010201112), we get a palindrome (31120402113).

It can be divided in two parts, 21110 and 201001, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 21110201001 in words is "twenty-one billion, one hundred ten million, two hundred one thousand, one".