21247614 has 12 divisors (see below), whose sum is σ = 46036536. Its totient is φ = 7082532.

The previous prime is 21247613. The next prime is 21247621. The reversal of 21247614 is 41674212.

21247614 is a `hidden beast` number, since 2 + 1 + 2 + 47 + 614 = 666.

It is a super-2 number, since 2×21247614² = 902922201385992, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21247613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 590194 + ... + 590229.

It is an arithmetic number, because the mean of its divisors is an integer number (3836378).

Almost surely, 2^21247614 is an apocalyptic number.

21247614 is an abundant number, since it is smaller than the sum of its proper divisors (24788922).

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

21247614 is a wasteful number, since it uses less digits than its factorization.

21247614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180431 (or 1180428 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 21247614 is about 4609.5134233452. The cubic root of 21247614 is about 276.9725456853.

The spelling of 21247614 in words is "twenty-one million, two hundred forty-seven thousand, six hundred fourteen".