21042443020250 has 128 divisors (see below), whose sum is σ = 39745588783680. Its totient is φ = 8341754880000.

The previous prime is 21042443020243. The next prime is 21042443020381. The reversal of 21042443020250 is 5202034424012.

It can be written as a sum of positive squares in 32 ways, for example, as 1118244915841 + 19924198104409 = 1057471^2 + 4463653^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17121596636 + ... + 17121597864.

Almost surely, 2^{21042443020250} is an apocalyptic number.

21042443020250 is a deficient number, since it is larger than the sum of its proper divisors (18703145763430).

21042443020250 is a wasteful number, since it uses less digits than its factorization.

21042443020250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613 (or 2603 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 21042443020250 its reverse (5202034424012), we get a palindrome (26244477444262).

The spelling of 21042443020250 in words is "twenty-one trillion, forty-two billion, four hundred forty-three million, twenty thousand, two hundred fifty".