21134516 has 48 divisors (see below), whose sum is σ = 42674688. Its totient is φ = 9081600.

The previous prime is 21134513. The next prime is 21134521. The reversal of 21134516 is 61543112.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 21134491 and 21134500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48821 + ... + 49251.

It is an arithmetic number, because the mean of its divisors is an integer number (889056).

Almost surely, 2^21134516 is an apocalyptic number.

21134516 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21134516 is an abundant number, since it is smaller than the sum of its proper divisors (21540172).

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

21134516 is a wasteful number, since it uses less digits than its factorization.

21134516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 510 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 21134516 is about 4597.2291654865. The cubic root of 21134516 is about 276.4802427930.

Adding to 21134516 its reverse (61543112), we get a palindrome (82677628).

The spelling of 21134516 in words is "twenty-one million, one hundred thirty-four thousand, five hundred sixteen".