21110020213 has 4 divisors (see below), whose sum is σ = 21184614208. Its totient is φ = 21035426220.

The previous prime is 21110020159. The next prime is 21110020231. The reversal of 21110020213 is 31202001112.

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-21110020213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110020193 and 21110020202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110020013) 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, 37296573 + ... + 37297138.

It is an arithmetic number, because the mean of its divisors is an integer number (5296153552).

Almost surely, 2^21110020213 is an apocalyptic number.

It is an amenable number.

21110020213 is a deficient number, since it is larger than the sum of its proper divisors (74593995).

21110020213 is an equidigital number, since it uses as much as digits as its factorization.

21110020213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74593994.

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

Adding to 21110020213 its reverse (31202001112), we get a palindrome (52312021325).

The spelling of 21110020213 in words is "twenty-one billion, one hundred ten million, twenty thousand, two hundred thirteen".