21422069 has 4 divisors (see below), whose sum is σ = 21715596. Its totient is φ = 21128544.

The previous prime is 21422053. The next prime is 21422077. The reversal of 21422069 is 96022412.

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 4571044 + 16851025 = 2138^2 + 4105^2 .

It is a cyclic number.

It is not a de Polignac number, because 21422069 - 2⁴ = 21422053 is a prime.

It is a super-2 number, since 2×21422069² = 917810080481522, 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 (21422029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146654 + ... + 146799.

It is an arithmetic number, because the mean of its divisors is an integer number (5428899).

Almost surely, 2^21422069 is an apocalyptic number.

It is an amenable number.

21422069 is a deficient number, since it is larger than the sum of its proper divisors (293527).

21422069 is an equidigital number, since it uses as much as digits as its factorization.

21422069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293526.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21422069 is about 4628.3981030158. The cubic root of 21422069 is about 277.7285145290.

The spelling of 21422069 in words is "twenty-one million, four hundred twenty-two thousand, sixty-nine".