21338388536050 has 72 divisors (see below), whose sum is σ = 42170329497600. Its totient is φ = 8031575635200.

The previous prime is 21338388536021. The next prime is 21338388536053. The reversal of 21338388536050 is 5063588383312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21338388535982 and 21338388536000.

It is not an unprimeable number, because it can be changed into a prime (21338388536053) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 69191695 + ... + 69499405.

It is an arithmetic number, because the mean of its divisors is an integer number (585699020800).

Almost surely, 2^{21338388536050} is an apocalyptic number.

21338388536050 is a deficient number, since it is larger than the sum of its proper divisors (20831940961550).

21338388536050 is a wasteful number, since it uses less digits than its factorization.

21338388536050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312556 (or 312534 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 55.

The spelling of 21338388536050 in words is "twenty-one trillion, three hundred thirty-eight billion, three hundred eighty-eight million, five hundred thirty-six thousand, fifty".