21133220133331 has 4 divisors (see below), whose sum is σ = 21133249981632. Its totient is φ = 21133190285032.

The previous prime is 21133220133313. The next prime is 21133220133391. The reversal of 21133220133331 is 13333102233112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21133220133331 - 2²⁵ = 21133186578899 is a prime.

It is a super-2 number, since 2×21133220133331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21133220133331.

It is not an unprimeable number, because it can be changed into a prime (21133220133301) 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, 13835656 + ... + 15286981.

It is an arithmetic number, because the mean of its divisors is an integer number (5283312495408).

Almost surely, 2^{21133220133331} is an apocalyptic number.

21133220133331 is a deficient number, since it is larger than the sum of its proper divisors (29848301).

21133220133331 is an equidigital number, since it uses as much as digits as its factorization.

21133220133331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29848300.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 21133220133331 its reverse (13333102233112), we get a palindrome (34466322366443).

The spelling of 21133220133331 in words is "twenty-one trillion, one hundred thirty-three billion, two hundred twenty million, one hundred thirty-three thousand, three hundred thirty-one".