21785893242 has 32 divisors (see below), whose sum is σ = 45099331200. Its totient is φ = 7007652288.

The previous prime is 21785893223. The next prime is 21785893243. The reversal of 21785893242 is 24239858712.

It is not an unprimeable number, because it can be changed into a prime (21785893243) 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, 287484 + ... + 355272.

It is an arithmetic number, because the mean of its divisors is an integer number (1409354100).

Almost surely, 2^21785893242 is an apocalyptic number.

21785893242 is an abundant number, since it is smaller than the sum of its proper divisors (23313437958).

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

21785893242 is a wasteful number, since it uses less digits than its factorization.

21785893242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69670.

The product of its digits is 1935360, while the sum is 51.

The spelling of 21785893242 in words is "twenty-one billion, seven hundred eighty-five million, eight hundred ninety-three thousand, two hundred forty-two".