21103313213 has 16 divisors (see below), whose sum is σ = 21801588480. Its totient is φ = 20416833216.

The previous prime is 21103313197. The next prime is 21103313249. The reversal of 21103313213 is 31231330112.

It is a cyclic number.

It is not a de Polignac number, because 21103313213 - 2⁴ = 21103313197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103013213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3794831 + ... + 3800387.

It is an arithmetic number, because the mean of its divisors is an integer number (1362599280).

Almost surely, 2^21103313213 is an apocalyptic number.

It is an amenable number.

21103313213 is a deficient number, since it is larger than the sum of its proper divisors (698275267).

21103313213 is an equidigital number, since it uses as much as digits as its factorization.

21103313213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21103313213 its reverse (31231330112), we get a palindrome (52334643325).

The spelling of 21103313213 in words is "twenty-one billion, one hundred three million, three hundred thirteen thousand, two hundred thirteen".