21213323011 has 4 divisors (see below), whose sum is σ = 21266757472. Its totient is φ = 21159888552.

The previous prime is 21213323009. The next prime is 21213323059. The reversal of 21213323011 is 11032331212.

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

It is a cyclic number.

It is not a de Polignac number, because 21213323011 - 2¹ = 21213323009 is a prime.

It is a super-2 number, since 2×21213323011² (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 21213323011.

It is not an unprimeable number, because it can be changed into a prime (21213323111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26716635 + ... + 26717428.

It is an arithmetic number, because the mean of its divisors is an integer number (5316689368).

Almost surely, 2^21213323011 is an apocalyptic number.

21213323011 is a deficient number, since it is larger than the sum of its proper divisors (53434461).

21213323011 is an equidigital number, since it uses as much as digits as its factorization.

21213323011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53434460.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21213323011 its reverse (11032331212), we get a palindrome (32245654223).

The spelling of 21213323011 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty-three thousand, eleven".