21001112012210 has 64 divisors (see below), whose sum is σ = 43673774607360. Its totient is φ = 7185994014720.

The previous prime is 21001112012047. The next prime is 21001112012269. The reversal of 21001112012210 is 1221021110012.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7464482 + ... + 9885378.

It is an arithmetic number, because the mean of its divisors is an integer number (682402728240).

Almost surely, 2^{21001112012210} is an apocalyptic number.

21001112012210 is an abundant number, since it is smaller than the sum of its proper divisors (22672662595150).

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

21001112012210 is a wasteful number, since it uses less digits than its factorization.

21001112012210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425571.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21001112012210 its reverse (1221021110012), we get a palindrome (22222133122222).

It can be divided in two parts, 210011 and 12012210, that added together give a palindrome (12222221).

The spelling of 21001112012210 in words is "twenty-one trillion, one billion, one hundred twelve million, twelve thousand, two hundred ten".