21101220333 has 20 divisors (see below), whose sum is σ = 31531027968. Its totient is φ = 14063262120.

The previous prime is 21101220311. The next prime is 21101220341. The reversal of 21101220333 is 33302210112.

21101220333 is a `hidden beast` number, since 2 + 110 + 1 + 220 + 333 = 666.

It is not a de Polignac number, because 21101220333 - 2¹⁸ = 21100958189 is a prime.

It is a super-2 number, since 2×21101220333² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101228333) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 245460 + ... + 320082.

Almost surely, 2^21101220333 is an apocalyptic number.

It is an amenable number.

21101220333 is a deficient number, since it is larger than the sum of its proper divisors (10429807635).

21101220333 is an equidigital number, since it uses as much as digits as its factorization.

21101220333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78126 (or 78117 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21101220333 its reverse (33302210112), we get a palindrome (54403430445).

The spelling of 21101220333 in words is "twenty-one billion, one hundred one million, two hundred twenty thousand, three hundred thirty-three".