21211121010 has 64 divisors (see below), whose sum is σ = 55314616320. Its totient is φ = 5185736640.

The previous prime is 21211121003. The next prime is 21211121021. The reversal of 21211121010 is 1012111212.

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 582532 + ... + 617871.

It is an arithmetic number, because the mean of its divisors is an integer number (864290880).

Almost surely, 2^21211121010 is an apocalyptic number.

21211121010 is an abundant number, since it is smaller than the sum of its proper divisors (34103495310).

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

21211121010 is a wasteful number, since it uses less digits than its factorization.

21211121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200463.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21211121010 its reverse (1012111212), we get a palindrome (22223232222).

The spelling of 21211121010 in words is "twenty-one billion, two hundred eleven million, one hundred twenty-one thousand, ten".