21594148 has 24 divisors (see below), whose sum is σ = 41755392. Its totient is φ = 9719424.

The previous prime is 21594137. The next prime is 21594149. The reversal of 21594148 is 84149512.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (21594149) 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 7 ways as a sum of consecutive naturals, for example, 5340 + ... + 8467.

It is an arithmetic number, because the mean of its divisors is an integer number (1739808).

Almost surely, 2^21594148 is an apocalyptic number.

It is an amenable number.

21594148 is a deficient number, since it is larger than the sum of its proper divisors (20161244).

21594148 is a wasteful number, since it uses less digits than its factorization.

21594148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13851 (or 13849 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 21594148 is about 4646.9503978416. The cubic root of 21594148 is about 278.4701772101.

The spelling of 21594148 in words is "twenty-one million, five hundred ninety-four thousand, one hundred forty-eight".