21113460 has 60 divisors (see below), whose sum is σ = 66238788. Its totient is φ = 5629824.

The previous prime is 21113459. The next prime is 21113467. The reversal of 21113460 is 6431112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10381284 + 10732176 = 3222^2 + 3276^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113467) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4897 + ... + 8136.

Almost surely, 2^21113460 is an apocalyptic number.

21113460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113460 is an abundant number, since it is smaller than the sum of its proper divisors (45125328).

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

21113460 is a wasteful number, since it uses less digits than its factorization.

21113460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13054 (or 13043 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21113460 is about 4594.9385197193. The cubic root of 21113460 is about 276.3883945832.

Adding to 21113460 its reverse (6431112), we get a palindrome (27544572).

The spelling of 21113460 in words is "twenty-one million, one hundred thirteen thousand, four hundred sixty".