21146531305603 has 16 divisors (see below), whose sum is σ = 23484884843520. Its totient is φ = 18879608473600.

The previous prime is 21146531305481. The next prime is 21146531305607. The reversal of 21146531305603 is 30650313564112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21146531305603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21146531305607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52476763 + ... + 52878196.

It is an arithmetic number, because the mean of its divisors is an integer number (1467805302720).

Almost surely, 2^{21146531305603} is an apocalyptic number.

21146531305603 is a deficient number, since it is larger than the sum of its proper divisors (2338353537917).

21146531305603 is a wasteful number, since it uses less digits than its factorization.

21146531305603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105355298.

The product of its (nonzero) digits is 194400, while the sum is 40.

Adding to 21146531305603 its reverse (30650313564112), we get a palindrome (51796844869715).

The spelling of 21146531305603 in words is "twenty-one trillion, one hundred forty-six billion, five hundred thirty-one million, three hundred five thousand, six hundred three".