21314261 has 4 divisors (see below), whose sum is σ = 22240992. Its totient is φ = 20387532.

The previous prime is 21314233. The next prime is 21314269. The reversal of 21314261 is 16241312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21314261 - 2¹⁸ = 21052117 is a prime.

It is a super-2 number, since 2×21314261² = 908595443952242, 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 (21314269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463331 + ... + 463376.

It is an arithmetic number, because the mean of its divisors is an integer number (5560248).

Almost surely, 2^21314261 is an apocalyptic number.

It is an amenable number.

21314261 is a deficient number, since it is larger than the sum of its proper divisors (926731).

21314261 is an equidigital number, since it uses as much as digits as its factorization.

21314261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926730.

The product of its digits is 288, while the sum is 20.

The square root of 21314261 is about 4616.7370512084. The cubic root of 21314261 is about 277.2618349894.

Adding to 21314261 its reverse (16241312), we get a palindrome (37555573).

It can be divided in two parts, 2131 and 4261, that multiplied together give a triangular number (9080191 = T₄₂₆₁).

The spelling of 21314261 in words is "twenty-one million, three hundred fourteen thousand, two hundred sixty-one".