21210213333 has 8 divisors (see below), whose sum is σ = 29044616608. Its totient is φ = 13757976144.

The previous prime is 21210213331. The next prime is 21210213371. The reversal of 21210213333 is 33331201212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21210213333 - 2¹ = 21210213331 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 (21210213331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95541391 + ... + 95541612.

It is an arithmetic number, because the mean of its divisors is an integer number (3630577076).

Almost surely, 2^21210213333 is an apocalyptic number.

It is an amenable number.

21210213333 is a deficient number, since it is larger than the sum of its proper divisors (7834403275).

21210213333 is a wasteful number, since it uses less digits than its factorization.

21210213333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191083043.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21210213333 its reverse (33331201212), we get a palindrome (54541414545).

The spelling of 21210213333 in words is "twenty-one billion, two hundred ten million, two hundred thirteen thousand, three hundred thirty-three".