21630363213666 has 8 divisors (see below), whose sum is σ = 43260726427344. Its totient is φ = 7210121071220.

The previous prime is 21630363213653. The next prime is 21630363213737. The reversal of 21630363213666 is 66631236303612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21630363213666 is an admirable number.

It is a super-2 number, since 2×21630363213666² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1802530267800 + ... + 1802530267811.

It is an arithmetic number, because the mean of its divisors is an integer number (5407590803418).

Almost surely, 2^{21630363213666} is an apocalyptic number.

21630363213666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21630363213666 is a wasteful number, since it uses less digits than its factorization.

21630363213666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605060535616.

The product of its (nonzero) digits is 2519424, while the sum is 48.

The spelling of 21630363213666 in words is "twenty-one trillion, six hundred thirty billion, three hundred sixty-three million, two hundred thirteen thousand, six hundred sixty-six".