21110200213 has 4 divisors (see below), whose sum is σ = 21119039020. Its totient is φ = 21101361408.

The previous prime is 21110200159. The next prime is 21110200217. The reversal of 21110200213 is 31200201112.

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 6480572004 + 14629628209 = 80502^2 + 120953^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110200213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110200193 and 21110200202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110200217) 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, 4415820 + ... + 4420597.

It is an arithmetic number, because the mean of its divisors is an integer number (5279759755).

Almost surely, 2^21110200213 is an apocalyptic number.

It is an amenable number.

21110200213 is a deficient number, since it is larger than the sum of its proper divisors (8838807).

21110200213 is an equidigital number, since it uses as much as digits as its factorization.

21110200213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8838806.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21110200213 its reverse (31200201112), we get a palindrome (52310401325).

The spelling of 21110200213 in words is "twenty-one billion, one hundred ten million, two hundred thousand, two hundred thirteen".