21630030361205 has 48 divisors (see below), whose sum is σ = 30288382540416. Its totient is φ = 14785609829760.

The previous prime is 21630030361201. The next prime is 21630030361217. The reversal of 21630030361205 is 50216303003612.

It is not a de Polignac number, because 21630030361205 - 2² = 21630030361201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630030361201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101597327 + ... + 101810003.

It is an arithmetic number, because the mean of its divisors is an integer number (631007969592).

Almost surely, 2^{21630030361205} is an apocalyptic number.

It is an amenable number.

21630030361205 is a deficient number, since it is larger than the sum of its proper divisors (8658352179211).

21630030361205 is a wasteful number, since it uses less digits than its factorization.

21630030361205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213994 (or 213987 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 32.

Adding to 21630030361205 its reverse (50216303003612), we get a palindrome (71846333364817).

The spelling of 21630030361205 in words is "twenty-one trillion, six hundred thirty billion, thirty million, three hundred sixty-one thousand, two hundred five".