21364420502050 has 12 divisors (see below), whose sum is σ = 39737822133906. Its totient is φ = 8545768200800.

The previous prime is 21364420502011. The next prime is 21364420502057. The reversal of 21364420502050 is 5020502446312.

It can be written as a sum of positive squares in 3 ways, for example, as 10255551500041 + 11108869002009 = 3202429^2 + 3332997^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21364420501997 and 21364420502015.

It is not an unprimeable number, because it can be changed into a prime (21364420502057) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213644204971 + ... + 213644205070.

Almost surely, 2^{21364420502050} is an apocalyptic number.

21364420502050 is a deficient number, since it is larger than the sum of its proper divisors (18373401631856).

21364420502050 is a wasteful number, since it uses less digits than its factorization.

21364420502050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427288410053 (or 427288410048 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 21364420502050 its reverse (5020502446312), we get a palindrome (26384922948362).

The spelling of 21364420502050 in words is "twenty-one trillion, three hundred sixty-four billion, four hundred twenty million, five hundred two thousand, fifty".