21124013201 has 4 divisors (see below), whose sum is σ = 21187832304. Its totient is φ = 21060194100.

The previous prime is 21124013161. The next prime is 21124013219. The reversal of 21124013201 is 10231042112.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21124013201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21124013201.

It is not an unprimeable number, because it can be changed into a prime (21124015201) 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, 31909055 + ... + 31909716.

It is an arithmetic number, because the mean of its divisors is an integer number (5296958076).

Almost surely, 2^21124013201 is an apocalyptic number.

It is an amenable number.

21124013201 is a deficient number, since it is larger than the sum of its proper divisors (63819103).

21124013201 is an equidigital number, since it uses as much as digits as its factorization.

21124013201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63819102.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21124013201 its reverse (10231042112), we get a palindrome (31355055313).

The spelling of 21124013201 in words is "twenty-one billion, one hundred twenty-four million, thirteen thousand, two hundred one".