21497829133 has 16 divisors (see below), whose sum is σ = 24140592576. Its totient is φ = 18972195840.

The previous prime is 21497829121. The next prime is 21497829149. The reversal of 21497829133 is 33192879412.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21497829133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21497829103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120685 + ... + 239917.

It is an arithmetic number, because the mean of its divisors is an integer number (1508787036).

Almost surely, 2^21497829133 is an apocalyptic number.

It is an amenable number.

21497829133 is a deficient number, since it is larger than the sum of its proper divisors (2642763443).

21497829133 is a wasteful number, since it uses less digits than its factorization.

21497829133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119724.

The product of its digits is 653184, while the sum is 49.

The spelling of 21497829133 in words is "twenty-one billion, four hundred ninety-seven million, eight hundred twenty-nine thousand, one hundred thirty-three".