21121313333 has 8 divisors (see below), whose sum is σ = 22051270656. Its totient is φ = 20192326000.

The previous prime is 21121313249. The next prime is 21121313357. The reversal of 21121313333 is 33331312112.

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

It is a cyclic number.

It is not a de Polignac number, because 21121313333 - 2¹⁰ = 21121312309 is a prime.

It is a super-2 number, since 2×21121313333² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121313299 and 21121313308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121313533) 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, 197813 + ... + 285258.

It is an arithmetic number, because the mean of its divisors is an integer number (2756408832).

Almost surely, 2^21121313333 is an apocalyptic number.

21121313333 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21121313333 is a deficient number, since it is larger than the sum of its proper divisors (929957323).

21121313333 is a wasteful number, since it uses less digits than its factorization.

21121313333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484995.

The product of its digits is 972, while the sum is 23.

Adding to 21121313333 its reverse (33331312112), we get a palindrome (54452625445).

The spelling of 21121313333 in words is "twenty-one billion, one hundred twenty-one million, three hundred thirteen thousand, three hundred thirty-three".