21411201 has 16 divisors (see below), whose sum is σ = 32707584. Its totient is φ = 12204624.

The previous prime is 21411199. The next prime is 21411209. The reversal of 21411201 is 10211412.

It is a happy number.

It is not a de Polignac number, because 21411201 - 2¹ = 21411199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21411209) 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 15 ways as a sum of consecutive naturals, for example, 9550 + ... + 11576.

It is an arithmetic number, because the mean of its divisors is an integer number (2044224).

Almost surely, 2^21411201 is an apocalyptic number.

21411201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21411201 is a deficient number, since it is larger than the sum of its proper divisors (11296383).

21411201 is a wasteful number, since it uses less digits than its factorization.

21411201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 21411201 is about 4627.2238977599. The cubic root of 21411201 is about 277.6815401670.

Adding to 21411201 its reverse (10211412), we get a palindrome (31622613).

It can be divided in two parts, 21411 and 201, that added together give a palindrome (21612).

The spelling of 21411201 in words is "twenty-one million, four hundred eleven thousand, two hundred one".