21101130 has 24 divisors (see below), whose sum is σ = 54863172. Its totient is φ = 5626944.

The previous prime is 21101123. The next prime is 21101207. The reversal of 21101130 is 3110112.

It can be written as a sum of positive squares in 2 ways, for example, as 19954089 + 1147041 = 4467^2 + 1071^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117139 + ... + 117318.

Almost surely, 2^21101130 is an apocalyptic number.

21101130 is an abundant number, since it is smaller than the sum of its proper divisors (33762042).

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

21101130 is a wasteful number, since it uses less digits than its factorization.

21101130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234470 (or 234467 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

The square root of 21101130 is about 4593.5966300928. The cubic root of 21101130 is about 276.3345816364.

Adding to 21101130 its reverse (3110112), we get a palindrome (24211242).

It can be divided in two parts, 2110 and 1130, that added together give a triangular number (3240 = T₈₀).

The spelling of 21101130 in words is "twenty-one million, one hundred one thousand, one hundred thirty".