21514201 has 4 divisors (see below), whose sum is σ = 22256100. Its totient is φ = 20772304.

The previous prime is 21514159. The next prime is 21514211. The reversal of 21514201 is 10241512.

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 10465225 + 11048976 = 3235^2 + 3324^2 .

It is a cyclic number.

It is not a de Polignac number, because 21514201 - 2⁹ = 21513689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21514211) 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, 370906 + ... + 370963.

It is an arithmetic number, because the mean of its divisors is an integer number (5564025).

Almost surely, 2^21514201 is an apocalyptic number.

It is an amenable number.

21514201 is a deficient number, since it is larger than the sum of its proper divisors (741899).

21514201 is an equidigital number, since it uses as much as digits as its factorization.

21514201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741898.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21514201 is about 4638.3403281777. The cubic root of 21514201 is about 278.1260965491.

Adding to 21514201 its reverse (10241512), we get a palindrome (31755713).

The spelling of 21514201 in words is "twenty-one million, five hundred fourteen thousand, two hundred one".