21231665106 has 16 divisors (see below), whose sum is σ = 42883760448. Its totient is φ = 7007150000.

The previous prime is 21231665099. The next prime is 21231665111. The reversal of 21231665106 is 60156613212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17517270 + ... + 17518481.

It is an arithmetic number, because the mean of its divisors is an integer number (2680235028).

Almost surely, 2^21231665106 is an apocalyptic number.

21231665106 is an abundant number, since it is smaller than the sum of its proper divisors (21652095342).

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

21231665106 is a wasteful number, since it uses less digits than its factorization.

21231665106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35035857.

The product of its (nonzero) digits is 12960, while the sum is 33.

The spelling of 21231665106 in words is "twenty-one billion, two hundred thirty-one million, six hundred sixty-five thousand, one hundred six".