21134493 has 16 divisors (see below), whose sum is σ = 32672640. Its totient is φ = 13476672.

The previous prime is 21134489. The next prime is 21134497. The reversal of 21134493 is 39443112.

21134493 is a `hidden beast` number, since 211 + 3 + 449 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21134489) and next prime (21134497).

It is not a de Polignac number, because 21134493 - 2² = 21134489 is a prime.

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 Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134497) 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 15 ways as a sum of consecutive naturals, for example, 16396 + ... + 17637.

It is an arithmetic number, because the mean of its divisors is an integer number (2042040).

Almost surely, 2^21134493 is an apocalyptic number.

21134493 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21134493 is a deficient number, since it is larger than the sum of its proper divisors (11538147).

21134493 is a wasteful number, since it uses less digits than its factorization.

21134493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34065 (or 34059 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 21134493 is about 4597.2266639791. The cubic root of 21134493 is about 276.4801424982.

The spelling of 21134493 in words is "twenty-one million, one hundred thirty-four thousand, four hundred ninety-three".