21001201110 has 48 divisors (see below), whose sum is σ = 56078891856. Its totient is φ = 5448959424.

The previous prime is 21001200991. The next prime is 21001201127. The reversal of 21001201110 is 1110210012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21001201092 and 21001201101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3150004 + ... + 3156663.

It is an arithmetic number, because the mean of its divisors is an integer number (1168310247).

Almost surely, 2^21001201110 is an apocalyptic number.

21001201110 is an abundant number, since it is smaller than the sum of its proper divisors (35077690746).

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

21001201110 is a wasteful number, since it uses less digits than its factorization.

21001201110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6306717 (or 6306714 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21001201110 its reverse (1110210012), we get a palindrome (22111411122).

It can be divided in two parts, 21001 and 201110, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 21001201110 in words is "twenty-one billion, one million, two hundred one thousand, one hundred ten".