21001000210 has 16 divisors (see below), whose sum is σ = 38155090176. Its totient is φ = 8321891248.

The previous prime is 21001000199. The next prime is 21001000213. The reversal of 21001000210 is 1200010012.

It is a junction number, because it is equal to n+sod(n) for n = 21001000193 and 21001000202.

It is not an unprimeable number, because it can be changed into a prime (21001000213) 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, 9812482 + ... + 9814621.

It is an arithmetic number, because the mean of its divisors is an integer number (2384693136).

Almost surely, 2^21001000210 is an apocalyptic number.

21001000210 is a deficient number, since it is larger than the sum of its proper divisors (17154089966).

21001000210 is a wasteful number, since it uses less digits than its factorization.

21001000210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19627217.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21001000210 its reverse (1200010012), we get a palindrome (22201010222).

It can be divided in two parts, 210010002 and 10, that added together give a palindrome (210010012).

The spelling of 21001000210 in words is "twenty-one billion, one million, two hundred ten", and thus it is an aban number.