21042241445 has 8 divisors (see below), whose sum is σ = 25259060736. Its totient is φ = 16828212496.

The previous prime is 21042241439. The next prime is 21042241447. The reversal of 21042241445 is 54414224012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21042241445 - 2²⁸ = 20773805989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042241447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680957 + ... + 711186.

It is an arithmetic number, because the mean of its divisors is an integer number (3157382592).

Almost surely, 2^21042241445 is an apocalyptic number.

It is an amenable number.

21042241445 is a deficient number, since it is larger than the sum of its proper divisors (4216819291).

21042241445 is a wasteful number, since it uses less digits than its factorization.

21042241445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395171.

The product of its (nonzero) digits is 10240, while the sum is 29.

Adding to 21042241445 its reverse (54414224012), we get a palindrome (75456465457).

The spelling of 21042241445 in words is "twenty-one billion, forty-two million, two hundred forty-one thousand, four hundred forty-five".