21385272568210 has 8 divisors (see below), whose sum is σ = 38493490622796. Its totient is φ = 8554109027280.

The previous prime is 21385272568193. The next prime is 21385272568211. The reversal of 21385272568210 is 1286527258312.

It can be written as a sum of positive squares in 2 ways, for example, as 19292589182889 + 2092683385321 = 4392333^2 + 1446611^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21385272568211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1069263628401 + ... + 1069263628420.

Almost surely, 2^{21385272568210} is an apocalyptic number.

21385272568210 is a deficient number, since it is larger than the sum of its proper divisors (17108218054586).

21385272568210 is a wasteful number, since it uses less digits than its factorization.

21385272568210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138527256828.

The product of its (nonzero) digits is 3225600, while the sum is 52.

The spelling of 21385272568210 in words is "twenty-one trillion, three hundred eighty-five billion, two hundred seventy-two million, five hundred sixty-eight thousand, two hundred ten".