21242240201 has 24 divisors (see below), whose sum is σ = 26455616064. Its totient is φ = 16699849920.

The previous prime is 21242240191. The next prime is 21242240209. The reversal of 21242240201 is 10204224212.

It is not a de Polignac number, because 21242240201 - 2³⁰ = 20168498377 is a prime.

It is a super-4 number, since 4×21242240201⁴ (a number of 42 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21242240209) 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 23 ways as a sum of consecutive naturals, for example, 128546 + ... + 242916.

It is an arithmetic number, because the mean of its divisors is an integer number (1102317336).

Almost surely, 2^21242240201 is an apocalyptic number.

It is an amenable number.

21242240201 is a deficient number, since it is larger than the sum of its proper divisors (5213375863).

21242240201 is a wasteful number, since it uses less digits than its factorization.

21242240201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114561 (or 114548 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21242240201 its reverse (10204224212), we get a palindrome (31446464413).

The spelling of 21242240201 in words is "twenty-one billion, two hundred forty-two million, two hundred forty thousand, two hundred one".