21203201115424 has 12 divisors (see below), whose sum is σ = 41743802196054. Its totient is φ = 10601600557696.

The previous prime is 21203201115391. The next prime is 21203201115443. The reversal of 21203201115424 is 42451110230212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12664345690000 + 8538855425424 = 3558700^2 + 2922132^2 .

It is a super-2 number, since 2×21203201115424² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21203201115392 and 21203201115401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331300017397 + ... + 331300017460.

Almost surely, 2^{21203201115424} is an apocalyptic number.

It is an amenable number.

21203201115424 is a deficient number, since it is larger than the sum of its proper divisors (20540601080630).

21203201115424 is an equidigital number, since it uses as much as digits as its factorization.

21203201115424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662600034867 (or 662600034859 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

Adding to 21203201115424 its reverse (42451110230212), we get a palindrome (63654311345636).

The spelling of 21203201115424 in words is "twenty-one trillion, two hundred three billion, two hundred one million, one hundred fifteen thousand, four hundred twenty-four".