21650344356 has 48 divisors (see below), whose sum is σ = 54287464896. Its totient is φ = 6690883584.

The previous prime is 21650344343. The next prime is 21650344403. The reversal of 21650344356 is 65344305612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 778341 + ... + 805676.

It is an arithmetic number, because the mean of its divisors is an integer number (1130988852).

Almost surely, 2^21650344356 is an apocalyptic number.

It is an amenable number.

21650344356 is an abundant number, since it is smaller than the sum of its proper divisors (32637120540).

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

21650344356 is a wasteful number, since it uses less digits than its factorization.

21650344356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584108 (or 1584106 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 21650344356 its reverse (65344305612), we get a palindrome (86994649968).

The spelling of 21650344356 in words is "twenty-one billion, six hundred fifty million, three hundred forty-four thousand, three hundred fifty-six".