21150706664985 has 32 divisors (see below), whose sum is σ = 34062357992448. Its totient is φ = 11206689785280.

The previous prime is 21150706664981. The next prime is 21150706664993. The reversal of 21150706664985 is 58946660705112.

It is not a de Polignac number, because 21150706664985 - 2² = 21150706664981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21150706664981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4391790 + ... + 7847880.

It is an arithmetic number, because the mean of its divisors is an integer number (1064448687264).

Almost surely, 2^{21150706664985} is an apocalyptic number.

It is an amenable number.

21150706664985 is a deficient number, since it is larger than the sum of its proper divisors (12911651327463).

21150706664985 is a wasteful number, since it uses less digits than its factorization.

21150706664985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3458765.

The product of its (nonzero) digits is 21772800, while the sum is 60.

The spelling of 21150706664985 in words is "twenty-one trillion, one hundred fifty billion, seven hundred six million, six hundred sixty-four thousand, nine hundred eighty-five".