21142666156 has 12 divisors (see below), whose sum is σ = 37066096368. Its totient is φ = 10552352912.

The previous prime is 21142666121. The next prime is 21142666189. The reversal of 21142666156 is 65166624112.

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, 4742536 + ... + 4746991.

It is an arithmetic number, because the mean of its divisors is an integer number (3088841364).

Almost surely, 2^21142666156 is an apocalyptic number.

It is an amenable number.

21142666156 is a deficient number, since it is larger than the sum of its proper divisors (15923430212).

21142666156 is a wasteful number, since it uses less digits than its factorization.

21142666156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9490088 (or 9490086 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The spelling of 21142666156 in words is "twenty-one billion, one hundred forty-two million, six hundred sixty-six thousand, one hundred fifty-six".