21050352 has 60 divisors (see below), whose sum is σ = 62384400. Its totient is φ = 6603264.

The previous prime is 21050339. The next prime is 21050357. The reversal of 21050352 is 25305012.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050357) by changing a digit.

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, 1852 + ... + 6747.

It is an arithmetic number, because the mean of its divisors is an integer number (1039740).

Almost surely, 2^21050352 is an apocalyptic number.

It is an amenable number.

21050352 is an abundant number, since it is smaller than the sum of its proper divisors (41334048).

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

21050352 is a wasteful number, since it uses less digits than its factorization.

21050352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8630 (or 8621 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 21050352 is about 4588.0662593297. The cubic root of 21050352 is about 276.1127453679.

Adding to 21050352 its reverse (25305012), we get a palindrome (46355364).

The spelling of 21050352 in words is "twenty-one million, fifty thousand, three hundred fifty-two".