21213311033 has 6 divisors (see below), whose sum is σ = 22175730234. Its totient is φ = 20290992656.

The previous prime is 21213311029. The next prime is 21213311039. The reversal of 21213311033 is 33011331212.

It can be written as a sum of positive squares in only one way, i.e., 14188859689 + 7024451344 = 119117^2 + 83812^2 .

It is not a de Polignac number, because 21213311033 - 2² = 21213311029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213310996 and 21213311014.

It is not an unprimeable number, because it can be changed into a prime (21213311039) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20049860 + ... + 20050917.

It is an arithmetic number, because the mean of its divisors is an integer number (3695955039).

Almost surely, 2^21213311033 is an apocalyptic number.

21213311033 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21213311033 is a deficient number, since it is larger than the sum of its proper divisors (962419201).

21213311033 is an equidigital number, since it uses as much as digits as its factorization.

21213311033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40100823 (or 40100800 counting only the distinct ones).

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

Adding to 21213311033 its reverse (33011331212), we get a palindrome (54224642245).

The spelling of 21213311033 in words is "twenty-one billion, two hundred thirteen million, three hundred eleven thousand, thirty-three".