21413106 has 128 divisors (see below), whose sum is σ = 58060800. Its totient is φ = 5762880.

The previous prime is 21413101. The next prime is 21413123. The reversal of 21413106 is 60131412.

It is a happy number.

It is a super-2 number, since 2×21413106² = 917042217134472, 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 (21413101) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 362905 + ... + 362963.

It is an arithmetic number, because the mean of its divisors is an integer number (453600).

Almost surely, 2^21413106 is an apocalyptic number.

21413106 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21413106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29030400).

21413106 is an abundant number, since it is smaller than the sum of its proper divisors (36647694).

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

21413106 is a wasteful number, since it uses less digits than its factorization.

21413106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 135 counting only the distinct ones).

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

The square root of 21413106 is about 4627.4297401473. The cubic root of 21413106 is about 277.6897752281.

Adding to 21413106 its reverse (60131412), we get a palindrome (81544518).

The spelling of 21413106 in words is "twenty-one million, four hundred thirteen thousand, one hundred six".