21241220444450 has 48 divisors (see below), whose sum is σ = 39812461276896. Its totient is φ = 8431163894400.

The previous prime is 21241220444447. The next prime is 21241220444453. The reversal of 21241220444450 is 5444402214212.

It is an interprime number because it is at equal distance from previous prime (21241220444447) and next prime (21241220444453).

It is a self number, because there is not a number n which added to its sum of digits gives 21241220444450.

It is not an unprimeable number, because it can be changed into a prime (21241220444453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133822334 + ... + 133980966.

It is an arithmetic number, because the mean of its divisors is an integer number (829426276602).

Almost surely, 2^{21241220444450} is an apocalyptic number.

21241220444450 is a deficient number, since it is larger than the sum of its proper divisors (18571240832446).

21241220444450 is a wasteful number, since it uses less digits than its factorization.

21241220444450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179219 (or 179214 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 35.

Adding to 21241220444450 its reverse (5444402214212), we get a palindrome (26685622658662).

The spelling of 21241220444450 in words is "twenty-one trillion, two hundred forty-one billion, two hundred twenty million, four hundred forty-four thousand, four hundred fifty".