21400330133 has 16 divisors (see below), whose sum is σ = 27888215040. Its totient is φ = 15936120576.

The previous prime is 21400330123. The next prime is 21400330153. The reversal of 21400330133 is 33103300412.

It is a cyclic number.

It is not a de Polignac number, because 21400330133 - 2⁶ = 21400330069 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400330123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6915173 + ... + 6918266.

It is an arithmetic number, because the mean of its divisors is an integer number (1743013440).

Almost surely, 2^21400330133 is an apocalyptic number.

It is an amenable number.

21400330133 is a deficient number, since it is larger than the sum of its proper divisors (6487884907).

21400330133 is a wasteful number, since it uses less digits than its factorization.

21400330133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13833476.

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

Adding to 21400330133 its reverse (33103300412), we get a palindrome (54503630545).

The spelling of 21400330133 in words is "twenty-one billion, four hundred million, three hundred thirty thousand, one hundred thirty-three".