21125201 has 8 divisors (see below), whose sum is σ = 22162560. Its totient is φ = 20097792.

The previous prime is 21125183. The next prime is 21125219. The reversal of 21125201 is 10252112.

It is an interprime number because it is at equal distance from previous prime (21125183) and next prime (21125219).

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 21125201 - 2¹⁴ = 21108817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21125501) 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, 2060 + ... + 6818.

It is an arithmetic number, because the mean of its divisors is an integer number (2770320).

Almost surely, 2^21125201 is an apocalyptic number.

It is an amenable number.

21125201 is a deficient number, since it is larger than the sum of its proper divisors (1037359).

21125201 is a wasteful number, since it uses less digits than its factorization.

21125201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4975.

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

The square root of 21125201 is about 4596.2159435779. The cubic root of 21125201 is about 276.4396174336.

Adding to 21125201 its reverse (10252112), we get a palindrome (31377313).

The spelling of 21125201 in words is "twenty-one million, one hundred twenty-five thousand, two hundred one".