1622342021 has 4 divisors (see below), whose sum is σ = 1622718732. Its totient is φ = 1621965312.

The previous prime is 1622342009. The next prime is 1622342047. The reversal of 1622342021 is 1202432261.

It is a happy number.

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 1388680225 + 233661796 = 37265^2 + 15286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622342021 - 2²⁶ = 1555233157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1622372021) 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, 181820 + ... + 190533.

It is an arithmetic number, because the mean of its divisors is an integer number (405679683).

Almost surely, 2^1622342021 is an apocalyptic number.

It is an amenable number.

1622342021 is a deficient number, since it is larger than the sum of its proper divisors (376711).

1622342021 is an equidigital number, since it uses as much as digits as its factorization.

1622342021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376710.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1622342021 is about 40278.3070771352. The cubic root of 1622342021 is about 1175.0259891037.

Adding to 1622342021 its reverse (1202432261), we get a palindrome (2824774282).

The spelling of 1622342021 in words is "one billion, six hundred twenty-two million, three hundred forty-two thousand, twenty-one".