21710242050 has 192 divisors, whose sum is σ = 63242809344. Its totient is φ = 4825497600.

The previous prime is 21710242039. The next prime is 21710242051. The reversal of 21710242050 is 5024201712.

It is a self number, because there is not a number n which added to its sum of digits gives 21710242050.

It is not an unprimeable number, because it can be changed into a prime (21710242051) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11602615 + ... + 11604485.

It is an arithmetic number, because the mean of its divisors is an integer number (329389632).

Almost surely, 2^21710242050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21710242050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31621404672).

21710242050 is an abundant number, since it is smaller than the sum of its proper divisors (41532567294).

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

21710242050 is a wasteful number, since it uses less digits than its factorization.

21710242050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193 (or 2188 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

Adding to 21710242050 its reverse (5024201712), we get a palindrome (26734443762).

The spelling of 21710242050 in words is "twenty-one billion, seven hundred ten million, two hundred forty-two thousand, fifty".