21113046 has 48 divisors (see below), whose sum is σ = 47718528. Its totient is φ = 6739200.

The previous prime is 21113041. The next prime is 21113069. The reversal of 21113046 is 64031112.

It is a happy number.

It is a super-2 number, since 2×21113046² = 891521422796232, which contains 22 as substring.

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 (21113041) 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, 87486 + ... + 87726.

It is an arithmetic number, because the mean of its divisors is an integer number (994136).

Almost surely, 2^21113046 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21113046, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23859264).

21113046 is an abundant number, since it is smaller than the sum of its proper divisors (26605482).

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

21113046 is a wasteful number, since it uses less digits than its factorization.

21113046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437 (or 434 counting only the distinct ones).

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

The square root of 21113046 is about 4594.8934699294. The cubic root of 21113046 is about 276.3865880651.

Adding to 21113046 its reverse (64031112), we get a palindrome (85144158).

The spelling of 21113046 in words is "twenty-one million, one hundred thirteen thousand, forty-six".