21663411150068 has 6 divisors (see below), whose sum is σ = 37910969512626. Its totient is φ = 10831705575032.

The previous prime is 21663411150067. The next prime is 21663411150083. The reversal of 21663411150068 is 86005111436612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21410776243684 + 252634906384 = 4627178^2 + 502628^2 .

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 as a sum of consecutive naturals, namely, 2707926393755 + ... + 2707926393762.

It is an arithmetic number, because the mean of its divisors is an integer number (6318494918771).

Almost surely, 2^{21663411150068} is an apocalyptic number.

It is an amenable number.

21663411150068 is a deficient number, since it is larger than the sum of its proper divisors (16247558362558).

21663411150068 is a wasteful number, since it uses less digits than its factorization.

21663411150068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5415852787521 (or 5415852787519 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 21663411150068 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred eleven million, one hundred fifty thousand, sixty-eight".