21348534 has 8 divisors (see below), whose sum is σ = 42697080. Its totient is φ = 7116176.

The previous prime is 21348527. The next prime is 21348539. The reversal of 21348534 is 43584312.

It is a sphenic number, since it is the product of 3 distinct primes.

21348534 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1779039 + ... + 1779050.

It is an arithmetic number, because the mean of its divisors is an integer number (5337135).

Almost surely, 2^21348534 is an apocalyptic number.

21348534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21348534 is a wasteful number, since it uses less digits than its factorization.

21348534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3558094.

The product of its digits is 11520, while the sum is 30.

The square root of 21348534 is about 4620.4473809362. The cubic root of 21348534 is about 277.4103663112.

The spelling of 21348534 in words is "twenty-one million, three hundred forty-eight thousand, five hundred thirty-four".