21609602133 has 16 divisors (see below), whose sum is σ = 32952806016. Its totient is φ = 12339385920.

The previous prime is 21609602129. The next prime is 21609602149. The reversal of 21609602133 is 33120690612.

It is not a de Polignac number, because 21609602133 - 2² = 21609602129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21609602094 and 21609602103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21609602123) 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, 343566 + ... + 401567.

It is an arithmetic number, because the mean of its divisors is an integer number (2059550376).

Almost surely, 2^21609602133 is an apocalyptic number.

It is an amenable number.

21609602133 is a deficient number, since it is larger than the sum of its proper divisors (11343203883).

21609602133 is a wasteful number, since it uses less digits than its factorization.

21609602133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746524.

The product of its (nonzero) digits is 11664, while the sum is 33.

The spelling of 21609602133 in words is "twenty-one billion, six hundred nine million, six hundred two thousand, one hundred thirty-three".