21785083242 has 24 divisors (see below), whose sum is σ = 47179531584. Its totient is φ = 6703102224.

The previous prime is 21785083219. The next prime is 21785083273. The reversal of 21785083242 is 24238058712.

It is a junction number, because it is equal to n+sod(n) for n = 21785083194 and 21785083203.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10741138 + ... + 10743165.

It is an arithmetic number, because the mean of its divisors is an integer number (1965813816).

Almost surely, 2^21785083242 is an apocalyptic number.

21785083242 is an abundant number, since it is smaller than the sum of its proper divisors (25394448342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21785083242 is a wasteful number, since it uses less digits than its factorization.

21785083242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21484334 (or 21484321 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The spelling of 21785083242 in words is "twenty-one billion, seven hundred eighty-five million, eighty-three thousand, two hundred forty-two".