21050201 has 8 divisors (see below), whose sum is σ = 21832320. Its totient is φ = 20271888.

The previous prime is 21050173. The next prime is 21050203. The reversal of 21050201 is 10205012.

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

It is a cyclic number.

It is not a de Polignac number, because 21050201 - 2⁶ = 21050137 is a prime.

It is a super-2 number, since 2×21050201² = 886221924280802, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21050203) 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 7 ways as a sum of consecutive naturals, for example, 15200 + ... + 16526.

It is an arithmetic number, because the mean of its divisors is an integer number (2729040).

Almost surely, 2^21050201 is an apocalyptic number.

It is an amenable number.

21050201 is a deficient number, since it is larger than the sum of its proper divisors (782119).

21050201 is a wasteful number, since it uses less digits than its factorization.

21050201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 21050201 is about 4588.0498035658. The cubic root of 21050201 is about 276.1120851553.

Adding to 21050201 its reverse (10205012), we get a palindrome (31255213).

The spelling of 21050201 in words is "twenty-one million, fifty thousand, two hundred one".