21340002 has 16 divisors (see below), whose sum is σ = 44926560. Its totient is φ = 6738912.

The previous prime is 21339991. The next prime is 21340003. The reversal of 21340002 is 20004312.

It is a self number, because there is not a number n which added to its sum of digits gives 21340002.

It is not an unprimeable number, because it can be changed into a prime (21340003) 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 7 ways as a sum of consecutive naturals, for example, 93483 + ... + 93710.

It is an arithmetic number, because the mean of its divisors is an integer number (2807910).

Almost surely, 2^21340002 is an apocalyptic number.

21340002 is an abundant number, since it is smaller than the sum of its proper divisors (23586558).

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

21340002 is a wasteful number, since it uses less digits than its factorization.

21340002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187217.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21340002 is about 4619.5240014530. The cubic root of 21340002 is about 277.3734054497.

Adding to 21340002 its reverse (20004312), we get a palindrome (41344314).

The spelling of 21340002 in words is "twenty-one million, three hundred forty thousand, two".