21814069 has 2 divisors, whose sum is σ = 21814070. Its totient is φ = 21814068.

The previous prime is 21814021. The next prime is 21814073. The reversal of 21814069 is 96041812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15311569 + 6502500 = 3913^2 + 2550^2 .

It is a cyclic number.

It is not a de Polignac number, because 21814069 - 2¹³ = 21805877 is a prime.

It is a super-2 number, since 2×21814069² = 951707212673522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21814069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21814369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10907034 + 10907035.

It is an arithmetic number, because the mean of its divisors is an integer number (10907035).

Almost surely, 2^21814069 is an apocalyptic number.

It is an amenable number.

21814069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21814069 is an equidigital number, since it uses as much as digits as its factorization.

21814069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 21814069 is about 4670.5533933357. The cubic root of 21814069 is about 279.4123261057.

The spelling of 21814069 in words is "twenty-one million, eight hundred fourteen thousand, sixty-nine".