21622043 has 4 divisors (see below), whose sum is σ = 21651888. Its totient is φ = 21592200.

The previous prime is 21622037. The next prime is 21622061. The reversal of 21622043 is 34022612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21622043 - 2¹⁴ = 21605659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21622033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13808 + ... + 15293.

It is an arithmetic number, because the mean of its divisors is an integer number (5412972).

Almost surely, 2^21622043 is an apocalyptic number.

21622043 is a deficient number, since it is larger than the sum of its proper divisors (29845).

21622043 is an equidigital number, since it uses as much as digits as its factorization.

21622043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29844.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21622043 is about 4649.9508599554. The cubic root of 21622043 is about 278.5900334965.

Adding to 21622043 its reverse (34022612), we get a palindrome (55644655).

The spelling of 21622043 in words is "twenty-one million, six hundred twenty-two thousand, forty-three".