21004614 has 24 divisors (see below), whose sum is σ = 47906040. Its totient is φ = 6632928.

The previous prime is 21004609. The next prime is 21004619. The reversal of 21004614 is 41640012.

It is an interprime number because it is at equal distance from previous prime (21004609) and next prime (21004619).

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 (21004619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30367 + ... + 31050.

It is an arithmetic number, because the mean of its divisors is an integer number (1996085).

Almost surely, 2^21004614 is an apocalyptic number.

21004614 is an abundant number, since it is smaller than the sum of its proper divisors (26901426).

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

21004614 is a wasteful number, since it uses less digits than its factorization.

21004614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61444 (or 61441 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 21004614 is about 4583.0790959790. The cubic root of 21004614 is about 275.9126219936.

Adding to 21004614 its reverse (41640012), we get a palindrome (62644626).

The spelling of 21004614 in words is "twenty-one million, four thousand, six hundred fourteen".