21102358170 has 32 divisors (see below), whose sum is σ = 53311222080. Its totient is φ = 5331121920.

The previous prime is 21102358169. The next prime is 21102358171. The reversal of 21102358170 is 7185320112.

It is an interprime number because it is at equal distance from previous prime (21102358169) and next prime (21102358171).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21102358171) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 18510271 + ... + 18511410.

It is an arithmetic number, because the mean of its divisors is an integer number (1665975690).

Almost surely, 2^21102358170 is an apocalyptic number.

21102358170 is an abundant number, since it is smaller than the sum of its proper divisors (32208863910).

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

21102358170 is a wasteful number, since it uses less digits than its factorization.

21102358170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37021710.

The product of its (nonzero) digits is 3360, while the sum is 30.

Adding to 21102358170 its reverse (7185320112), we get a palindrome (28287678282).

The spelling of 21102358170 in words is "twenty-one billion, one hundred two million, three hundred fifty-eight thousand, one hundred seventy".