21113411201 has 4 divisors (see below), whose sum is σ = 21331075332. Its totient is φ = 20895747072.

The previous prime is 21113411117. The next prime is 21113411233. The reversal of 21113411201 is 10211431112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10791054400 + 10322356801 = 103880^2 + 101599^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21113411201 is a prime.

It is a super-2 number, since 2×21113411201² (a number of 21 digits) contains 22 as substring.

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 21113411201.

It is not an unprimeable number, because it can be changed into a prime (21113411251) 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, 108831920 + ... + 108832113.

It is an arithmetic number, because the mean of its divisors is an integer number (5332768833).

Almost surely, 2^21113411201 is an apocalyptic number.

It is an amenable number.

21113411201 is a deficient number, since it is larger than the sum of its proper divisors (217664131).

21113411201 is an equidigital number, since it uses as much as digits as its factorization.

21113411201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217664130.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21113411201 its reverse (10211431112), we get a palindrome (31324842313).

The spelling of 21113411201 in words is "twenty-one billion, one hundred thirteen million, four hundred eleven thousand, two hundred one".