21001111201110 has 64 divisors (see below), whose sum is σ = 51766472689344. Its totient is φ = 5448771532800.

The previous prime is 21001111201099. The next prime is 21001111201111. The reversal of 21001111201110 is 1110211110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001111201111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38670250 + ... + 39209570.

It is an arithmetic number, because the mean of its divisors is an integer number (808851135771).

Almost surely, 2^{21001111201110} is an apocalyptic number.

21001111201110 is an abundant number, since it is smaller than the sum of its proper divisors (30765361488234).

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

21001111201110 is a wasteful number, since it uses less digits than its factorization.

21001111201110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574449.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21001111201110 its reverse (1110211110012), we get a palindrome (22111322311122).

It can be divided in two parts, 21001 and 111201110, that added together give a palindrome (111222111).

The spelling of 21001111201110 in words is "twenty-one trillion, one billion, one hundred eleven million, two hundred one thousand, one hundred ten".