21300501 has 8 divisors (see below), whose sum is σ = 29895520. Its totient is φ = 13452912.

The previous prime is 21300491. The next prime is 21300509. The reversal of 21300501 is 10500312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21300501 - 2¹³ = 21292309 is a prime.

It is a super-2 number, since 2×21300501² = 907422685702002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186790 + ... + 186903.

It is an arithmetic number, because the mean of its divisors is an integer number (3736940).

Almost surely, 2^21300501 is an apocalyptic number.

It is an amenable number.

21300501 is a deficient number, since it is larger than the sum of its proper divisors (8595019).

21300501 is a wasteful number, since it uses less digits than its factorization.

21300501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373715.

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

The square root of 21300501 is about 4615.2465806282. The cubic root of 21300501 is about 277.2021575098.

Adding to 21300501 its reverse (10500312), we get a palindrome (31800813).

The spelling of 21300501 in words is "twenty-one million, three hundred thousand, five hundred one".