21663411150064 has 20 divisors (see below), whose sum is σ = 42171782612680. Its totient is φ = 10780370475840.

The previous prime is 21663411149957. The next prime is 21663411150067. The reversal of 21663411150064 is 46005111436612.

It is a junction number, because it is equal to n+sod(n) for n = 21663411149999 and 21663411150026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21663411150067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3208440219 + ... + 3208446970.

It is an arithmetic number, because the mean of its divisors is an integer number (2108589130634).

Almost surely, 2^{21663411150064} is an apocalyptic number.

It is an amenable number.

21663411150064 is a deficient number, since it is larger than the sum of its proper divisors (20508371462616).

21663411150064 is a wasteful number, since it uses less digits than its factorization.

21663411150064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6416887408 (or 6416887402 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

Adding to 21663411150064 its reverse (46005111436612), we get a palindrome (67668522586676).

The spelling of 21663411150064 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred eleven million, one hundred fifty thousand, sixty-four".