21385355170 has 8 divisors (see below), whose sum is σ = 38493639324. Its totient is φ = 8554142064.

The previous prime is 21385355161. The next prime is 21385355197. The reversal of 21385355170 is 7155358312.

It can be written as a sum of positive squares in 2 ways, for example, as 21002096241 + 383258929 = 144921^2 + 19577^2 .

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

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, 1069267749 + ... + 1069267768.

Almost surely, 2^21385355170 is an apocalyptic number.

21385355170 is a deficient number, since it is larger than the sum of its proper divisors (17108284154).

21385355170 is a wasteful number, since it uses less digits than its factorization.

21385355170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138535524.

The product of its (nonzero) digits is 126000, while the sum is 40.

The spelling of 21385355170 in words is "twenty-one billion, three hundred eighty-five million, three hundred fifty-five thousand, one hundred seventy".