21320320133 has 8 divisors (see below), whose sum is σ = 24367133952. Its totient is φ = 18273769776.

The previous prime is 21320320127. The next prime is 21320320139. The reversal of 21320320133 is 33102302312.

It is an interprime number because it is at equal distance from previous prime (21320320127) and next prime (21320320139).

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 21320320133 - 2⁴ = 21320320117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320320139) 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, 158516 + ... + 260322.

It is an arithmetic number, because the mean of its divisors is an integer number (3045891744).

Almost surely, 2^21320320133 is an apocalyptic number.

It is an amenable number.

21320320133 is a deficient number, since it is larger than the sum of its proper divisors (3046813819).

21320320133 is a wasteful number, since it uses less digits than its factorization.

21320320133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131731.

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

Adding to 21320320133 its reverse (33102302312), we get a palindrome (54422622445).

The spelling of 21320320133 in words is "twenty-one billion, three hundred twenty million, three hundred twenty thousand, one hundred thirty-three".