21034616 has 32 divisors (see below), whose sum is σ = 41212800. Its totient is φ = 10053120.

The previous prime is 21034613. The next prime is 21034667. The reversal of 21034616 is 61643012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21034591 and 21034600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21596 + ... + 22548.

It is an arithmetic number, because the mean of its divisors is an integer number (1287900).

Almost surely, 2^21034616 is an apocalyptic number.

It is an amenable number.

21034616 is a deficient number, since it is larger than the sum of its proper divisors (20178184).

21034616 is a wasteful number, since it uses less digits than its factorization.

21034616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079 (or 1075 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21034616 is about 4586.3510550327. The cubic root of 21034616 is about 276.0439263559.

Adding to 21034616 its reverse (61643012), we get a palindrome (82677628).

The spelling of 21034616 in words is "twenty-one million, thirty-four thousand, six hundred sixteen".