21609740132 has 12 divisors (see below), whose sum is σ = 37819332096. Its totient is φ = 10804216680.

The previous prime is 21609740099. The next prime is 21609740143. The reversal of 21609740132 is 23104790612.

It is a junction number, because it is equal to n+sod(n) for n = 21609740092 and 21609740101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84728 + ... + 224495.

It is an arithmetic number, because the mean of its divisors is an integer number (3151611008).

Almost surely, 2^21609740132 is an apocalyptic number.

It is an amenable number.

21609740132 is a deficient number, since it is larger than the sum of its proper divisors (16209591964).

21609740132 is a wasteful number, since it uses less digits than its factorization.

21609740132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326698 (or 326696 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 21609740132 in words is "twenty-one billion, six hundred nine million, seven hundred forty thousand, one hundred thirty-two".