21006783332 has 24 divisors (see below), whose sum is σ = 37953603072. Its totient is φ = 10163001600.

The previous prime is 21006783283. The next prime is 21006783367. The reversal of 21006783332 is 23338760012.

It is a junction number, because it is equal to n+sod(n) for n = 21006783292 and 21006783301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1441193 + ... + 1455695.

It is an arithmetic number, because the mean of its divisors is an integer number (1581400128).

Almost surely, 2^21006783332 is an apocalyptic number.

It is an amenable number.

21006783332 is a deficient number, since it is larger than the sum of its proper divisors (16946819740).

21006783332 is a wasteful number, since it uses less digits than its factorization.

21006783332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26219 (or 26217 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The spelling of 21006783332 in words is "twenty-one billion, six million, seven hundred eighty-three thousand, three hundred thirty-two".