21501014 has 4 divisors (see below), whose sum is σ = 32251524. Its totient is φ = 10750506.

The previous prime is 21500953. The next prime is 21501023. The reversal of 21501014 is 41010512.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21501014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5375252 + ... + 5375255.

It is an arithmetic number, because the mean of its divisors is an integer number (8062881).

Almost surely, 2^21501014 is an apocalyptic number.

21501014 is a deficient number, since it is larger than the sum of its proper divisors (10750510).

21501014 is a wasteful number, since it uses less digits than its factorization.

21501014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10750509.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 21501014 is about 4636.9185888907. The cubic root of 21501014 is about 278.0692596960.

Adding to 21501014 its reverse (41010512), we get a palindrome (62511526).

The spelling of 21501014 in words is "twenty-one million, five hundred one thousand, fourteen".