21006600433 has 16 divisors (see below), whose sum is σ = 25887810816. Its totient is φ = 16599049920.

The previous prime is 21006600421. The next prime is 21006600451. The reversal of 21006600433 is 33400660012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21006600433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21006600398 and 21006600407.

It is not an unprimeable number, because it can be changed into a prime (21006600493) 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, 78973 + ... + 219658.

It is an arithmetic number, because the mean of its divisors is an integer number (1617988176).

Almost surely, 2^21006600433 is an apocalyptic number.

It is an amenable number.

21006600433 is a deficient number, since it is larger than the sum of its proper divisors (4881210383).

21006600433 is a wasteful number, since it uses less digits than its factorization.

21006600433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299424.

The product of its (nonzero) digits is 2592, while the sum is 25.

The spelling of 21006600433 in words is "twenty-one billion, six million, six hundred thousand, four hundred thirty-three".