21663602213141 has 16 divisors (see below), whose sum is σ = 24868441069056. Its totient is φ = 18486279380976.

The previous prime is 21663602213119. The next prime is 21663602213213. The reversal of 21663602213141 is 14131220636612.

It is a cyclic number.

It is not a de Polignac number, because 21663602213141 - 2²² = 21663598018837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21663602213095 and 21663602213104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21663602213441) 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, 42629750 + ... + 43134936.

It is an arithmetic number, because the mean of its divisors is an integer number (1554277566816).

Almost surely, 2^{21663602213141} is an apocalyptic number.

It is an amenable number.

21663602213141 is a deficient number, since it is larger than the sum of its proper divisors (3204838855915).

21663602213141 is a wasteful number, since it uses less digits than its factorization.

21663602213141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532408.

The product of its (nonzero) digits is 62208, while the sum is 38.

Adding to 21663602213141 its reverse (14131220636612), we get a palindrome (35794822849753).

The spelling of 21663602213141 in words is "twenty-one trillion, six hundred sixty-three billion, six hundred two million, two hundred thirteen thousand, one hundred forty-one".