21307350 has 24 divisors (see below), whose sum is σ = 52842600. Its totient is φ = 5681920.

The previous prime is 21307339. The next prime is 21307367. The reversal of 21307350 is 5370312.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70875 + ... + 71174.

It is an arithmetic number, because the mean of its divisors is an integer number (2201775).

Almost surely, 2^21307350 is an apocalyptic number.

21307350 is an abundant number, since it is smaller than the sum of its proper divisors (31535250).

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

21307350 is a wasteful number, since it uses less digits than its factorization.

21307350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142064 (or 142059 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 21307350 is about 4615.9885181833. The cubic root of 21307350 is about 277.2318650133.

Adding to 21307350 its reverse (5370312), we get a palindrome (26677662).

The spelling of 21307350 in words is "twenty-one million, three hundred seven thousand, three hundred fifty".