21355087010 has 32 divisors (see below), whose sum is σ = 39177918000. Its totient is φ = 8377977088.

The previous prime is 21355086997. The next prime is 21355087027. The reversal of 21355087010 is 1078055312.

It can be written as a sum of positive squares in 8 ways, for example, as 10046253361 + 11308833649 = 100231^2 + 106343^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2185616 + ... + 2195364.

Almost surely, 2^21355087010 is an apocalyptic number.

21355087010 is a deficient number, since it is larger than the sum of its proper divisors (17822830990).

21355087010 is a wasteful number, since it uses less digits than its factorization.

21355087010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13942.

The product of its (nonzero) digits is 8400, while the sum is 32.

The spelling of 21355087010 in words is "twenty-one billion, three hundred fifty-five million, eighty-seven thousand, ten".