21120301 has 4 divisors (see below), whose sum is σ = 21188092. Its totient is φ = 21052512.

The previous prime is 21120283. The next prime is 21120311. The reversal of 21120301 is 10302112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5517801 + 15602500 = 2349^2 + 3950^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120301 - 2¹⁷ = 20989229 is a prime.

It is a super-2 number, since 2×21120301² = 892134228661202, 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 (21120311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33426 + ... + 34051.

It is an arithmetic number, because the mean of its divisors is an integer number (5297023).

Almost surely, 2^21120301 is an apocalyptic number.

It is an amenable number.

21120301 is a deficient number, since it is larger than the sum of its proper divisors (67791).

21120301 is an equidigital number, since it uses as much as digits as its factorization.

21120301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67790.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21120301 is about 4595.6828654728. The cubic root of 21120301 is about 276.4182423491.

Adding to 21120301 its reverse (10302112), we get a palindrome (31422413).

The spelling of 21120301 in words is "twenty-one million, one hundred twenty thousand, three hundred one".