21011120210 has 16 divisors (see below), whose sum is σ = 37989616896. Its totient is φ = 8366759088.

The previous prime is 21011120183. The next prime is 21011120219. The reversal of 21011120210 is 1202111012.

It is a junction number, because it is equal to n+sod(n) for n = 21011120191 and 21011120200.

It is not an unprimeable number, because it can be changed into a prime (21011120219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4708784 + ... + 4713243.

It is an arithmetic number, because the mean of its divisors is an integer number (2374351056).

Almost surely, 2^21011120210 is an apocalyptic number.

21011120210 is a deficient number, since it is larger than the sum of its proper divisors (16978496686).

21011120210 is a wasteful number, since it uses less digits than its factorization.

21011120210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9422257.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21011120210 its reverse (1202111012), we get a palindrome (22213231222).

The spelling of 21011120210 in words is "twenty-one billion, eleven million, one hundred twenty thousand, two hundred ten".