21345350 has 24 divisors (see below), whose sum is σ = 42757680. Its totient is φ = 7881120.

The previous prime is 21345349. The next prime is 21345367. The reversal of 21345350 is 5354312.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 15770 + ... + 17069.

It is an arithmetic number, because the mean of its divisors is an integer number (1781570).

Almost surely, 2^21345350 is an apocalyptic number.

21345350 is an abundant number, since it is smaller than the sum of its proper divisors (21412330).

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

21345350 is a wasteful number, since it uses less digits than its factorization.

21345350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32864 (or 32859 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 21345350 is about 4620.1028127088. The cubic root of 21345350 is about 277.3965742865.

Adding to 21345350 its reverse (5354312), we get a palindrome (26699662).

The spelling of 21345350 in words is "twenty-one million, three hundred forty-five thousand, three hundred fifty".