21702388242 has 8 divisors (see below), whose sum is σ = 43404776496. Its totient is φ = 7234129412.

The previous prime is 21702388223. The next prime is 21702388243. The reversal of 21702388242 is 24288320712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21702388242 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21702388242.

It is not an unprimeable number, because it can be changed into a prime (21702388243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1808532348 + ... + 1808532359.

It is an arithmetic number, because the mean of its divisors is an integer number (5425597062).

Almost surely, 2^21702388242 is an apocalyptic number.

21702388242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21702388242 is a wasteful number, since it uses less digits than its factorization.

21702388242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617064712.

The product of its (nonzero) digits is 86016, while the sum is 39.

The spelling of 21702388242 in words is "twenty-one billion, seven hundred two million, three hundred eighty-eight thousand, two hundred forty-two".