22351421 has 4 divisors (see below), whose sum is σ = 22394844. Its totient is φ = 22308000.

The previous prime is 22351411. The next prime is 22351453. The reversal of 22351421 is 12415322.

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 12040900 + 10310521 = 3470^2 + 3211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22351421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22351393 and 22351402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22351411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20930 + ... + 21971.

It is an arithmetic number, because the mean of its divisors is an integer number (5598711).

Almost surely, 2^22351421 is an apocalyptic number.

It is an amenable number.

22351421 is a deficient number, since it is larger than the sum of its proper divisors (43423).

22351421 is an equidigital number, since it uses as much as digits as its factorization.

22351421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43422.

The product of its digits is 480, while the sum is 20.

The square root of 22351421 is about 4727.7289473911. The cubic root of 22351421 is about 281.6880215983.

Adding to 22351421 its reverse (12415322), we get a palindrome (34766743).

The spelling of 22351421 in words is "twenty-two million, three hundred fifty-one thousand, four hundred twenty-one".