21210103210 has 32 divisors (see below), whose sum is σ = 41086669392. Its totient is φ = 7854074880.

The previous prime is 21210103183. The next prime is 21210103241. The reversal of 21210103210 is 1230101212.

21210103210 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 3316492921 + 17893610289 = 57589^2 + 133767^2 .

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1012297 + ... + 1033036.

Almost surely, 2^21210103210 is an apocalyptic number.

21210103210 is a deficient number, since it is larger than the sum of its proper divisors (19876566182).

21210103210 is a wasteful number, since it uses less digits than its factorization.

21210103210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045418.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21210103210 its reverse (1230101212), we get a palindrome (22440204422).

The spelling of 21210103210 in words is "twenty-one billion, two hundred ten million, one hundred three thousand, two hundred ten".