21422043331 has 4 divisors (see below), whose sum is σ = 23069892832. Its totient is φ = 19774193832.

The previous prime is 21422043317. The next prime is 21422043371. The reversal of 21422043331 is 13334022412.

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 21422043331 - 2¹⁹ = 21421519043 is a prime.

It is a super-2 number, since 2×21422043331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21422043296 and 21422043305.

It is not an unprimeable number, because it can be changed into a prime (21422043311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 823924731 + ... + 823924756.

It is an arithmetic number, because the mean of its divisors is an integer number (5767473208).

Almost surely, 2^21422043331 is an apocalyptic number.

21422043331 is a deficient number, since it is larger than the sum of its proper divisors (1647849501).

21422043331 is a wasteful number, since it uses less digits than its factorization.

21422043331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647849500.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21422043331 its reverse (13334022412), we get a palindrome (34756065743).

The spelling of 21422043331 in words is "twenty-one billion, four hundred twenty-two million, forty-three thousand, three hundred thirty-one".