21155152616066 has 16 divisors (see below), whose sum is σ = 36437852581440. Its totient is φ = 9023524811280.

The previous prime is 21155152616029. The next prime is 21155152616149. The reversal of 21155152616066 is 66061625155112.

It is a self number, because there is not a number n which added to its sum of digits gives 21155152616066.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3580760861 + ... + 3580766768.

It is an arithmetic number, because the mean of its divisors is an integer number (2277365786340).

Almost surely, 2^{21155152616066} is an apocalyptic number.

21155152616066 is a deficient number, since it is larger than the sum of its proper divisors (15282699965374).

21155152616066 is a wasteful number, since it uses less digits than its factorization.

21155152616066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7161527849.

The product of its (nonzero) digits is 648000, while the sum is 47.

The spelling of 21155152616066 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-two million, six hundred sixteen thousand, sixty-six".