21340152 has 64 divisors (see below), whose sum is σ = 61209600. Its totient is φ = 6881760.

The previous prime is 21340147. The next prime is 21340171. The reversal of 21340152 is 25104312.

21340152 is a `hidden beast` number, since 213 + 401 + 52 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5103 + ... + 8289.

It is an arithmetic number, because the mean of its divisors is an integer number (956400).

Almost surely, 2^21340152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21340152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30604800).

21340152 is an abundant number, since it is smaller than the sum of its proper divisors (39869448).

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

21340152 is a wasteful number, since it uses less digits than its factorization.

21340152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3233 (or 3223 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 21340152 is about 4619.5402368634. The cubic root of 21340152 is about 277.3740553389.

Adding to 21340152 its reverse (25104312), we get a palindrome (46444464).

The spelling of 21340152 in words is "twenty-one million, three hundred forty thousand, one hundred fifty-two".