21422613 has 8 divisors (see below), whose sum is σ = 28656576. Its totient is φ = 14235200.

The previous prime is 21422587. The next prime is 21422627. The reversal of 21422613 is 31622412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21422613 is a prime.

It is a super-3 number, since 3×21422613³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21422613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422693) 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 7 ways as a sum of consecutive naturals, for example, 10548 + ... + 12413.

It is an arithmetic number, because the mean of its divisors is an integer number (3582072).

Almost surely, 2^21422613 is an apocalyptic number.

It is an amenable number.

21422613 is a deficient number, since it is larger than the sum of its proper divisors (7233963).

21422613 is a wasteful number, since it uses less digits than its factorization.

21422613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23275.

The product of its digits is 576, while the sum is 21.

The square root of 21422613 is about 4628.4568702754. The cubic root of 21422613 is about 277.7308654229.

The spelling of 21422613 in words is "twenty-one million, four hundred twenty-two thousand, six hundred thirteen".