21213200333 has 4 divisors (see below), whose sum is σ = 22844984988. Its totient is φ = 19581415680.

The previous prime is 21213200329. The next prime is 21213200347. The reversal of 21213200333 is 33300231212.

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 12312787369 + 8900412964 = 110963^2 + 94342^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213200333 - 2² = 21213200329 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 (21213200033) 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, 815892308 + ... + 815892333.

It is an arithmetic number, because the mean of its divisors is an integer number (5711246247).

Almost surely, 2^21213200333 is an apocalyptic number.

It is an amenable number.

21213200333 is a deficient number, since it is larger than the sum of its proper divisors (1631784655).

21213200333 is a wasteful number, since it uses less digits than its factorization.

21213200333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631784654.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21213200333 its reverse (33300231212), we get a palindrome (54513431545).

The spelling of 21213200333 in words is "twenty-one billion, two hundred thirteen million, two hundred thousand, three hundred thirty-three".