21010112010 has 48 divisors (see below), whose sum is σ = 55156667904. Its totient is φ = 5548298976.

The previous prime is 21010111981. The next prime is 21010112017. The reversal of 21010112010 is 1021101012.

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 = 21010111983 and 21010112001.

It is not an unprimeable number, because it can be changed into a prime (21010112017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1123962 + ... + 1142501.

It is an arithmetic number, because the mean of its divisors is an integer number (1149097248).

Almost surely, 2^21010112010 is an apocalyptic number.

21010112010 is an abundant number, since it is smaller than the sum of its proper divisors (34146555894).

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

21010112010 is a wasteful number, since it uses less digits than its factorization.

21010112010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266579 (or 2266576 counting only the distinct ones).

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

Adding to 21010112010 its reverse (1021101012), we get a palindrome (22031213022).

It can be divided in two parts, 210101 and 12010, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 21010112010 in words is "twenty-one billion, ten million, one hundred twelve thousand, ten".