21242403201 has 4 divisors (see below), whose sum is σ = 28323204272. Its totient is φ = 14161602132.

The previous prime is 21242403187. The next prime is 21242403209. The reversal of 21242403201 is 10230424212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21242403201 - 2⁷ = 21242403073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21242403209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3540400531 + ... + 3540400536.

It is an arithmetic number, because the mean of its divisors is an integer number (7080801068).

Almost surely, 2^21242403201 is an apocalyptic number.

It is an amenable number.

21242403201 is a deficient number, since it is larger than the sum of its proper divisors (7080801071).

21242403201 is an equidigital number, since it uses as much as digits as its factorization.

21242403201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7080801070.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21242403201 its reverse (10230424212), we get a palindrome (31472827413).

The spelling of 21242403201 in words is "twenty-one billion, two hundred forty-two million, four hundred three thousand, two hundred one".