21031103210 has 16 divisors (see below), whose sum is σ = 40767984936. Its totient is φ = 7765330368.

The previous prime is 21031103201. The next prime is 21031103213. The reversal of 21031103210 is 1230113012.

It can be written as a sum of positive squares in 4 ways, for example, as 7586932609 + 13444170601 = 87103^2 + 115949^2 .

It is not an unprimeable number, because it can be changed into a prime (21031103213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80888729 + ... + 80888988.

Almost surely, 2^21031103210 is an apocalyptic number.

21031103210 is a deficient number, since it is larger than the sum of its proper divisors (19736881726).

21031103210 is a wasteful number, since it uses less digits than its factorization.

21031103210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161777737.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21031103210 its reverse (1230113012), we get a palindrome (22261216222).

The spelling of 21031103210 in words is "twenty-one billion, thirty-one million, one hundred three thousand, two hundred ten".