21001350 has 24 divisors (see below), whose sum is σ = 52083720. Its totient is φ = 5600320.

The previous prime is 21001349. The next prime is 21001367. The reversal of 21001350 is 5310012.

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, 69855 + ... + 70154.

It is an arithmetic number, because the mean of its divisors is an integer number (2170155).

Almost surely, 2^21001350 is an apocalyptic number.

21001350 is an abundant number, since it is smaller than the sum of its proper divisors (31082370).

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

21001350 is a wasteful number, since it uses less digits than its factorization.

21001350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140024 (or 140019 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 21001350 is about 4582.7229896646. The cubic root of 21001350 is about 275.8983294918.

Adding to 21001350 its reverse (5310012), we get a palindrome (26311362).

The spelling of 21001350 in words is "twenty-one million, one thousand, three hundred fifty".