21124223445 has 48 divisors (see below), whose sum is σ = 37198904832. Its totient is φ = 10229057280.

The previous prime is 21124223411. The next prime is 21124223459. The reversal of 21124223445 is 54432242112.

It is a happy number.

It is not a de Polignac number, because 21124223445 - 2⁶ = 21124223381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86332 + ... + 222938.

It is an arithmetic number, because the mean of its divisors is an integer number (774977184).

Almost surely, 2^21124223445 is an apocalyptic number.

It is an amenable number.

21124223445 is a deficient number, since it is larger than the sum of its proper divisors (16074681387).

21124223445 is a wasteful number, since it uses less digits than its factorization.

21124223445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136702 (or 136689 counting only the distinct ones).

The product of its digits is 15360, while the sum is 30.

Adding to 21124223445 its reverse (54432242112), we get a palindrome (75556465557).

The spelling of 21124223445 in words is "twenty-one billion, one hundred twenty-four million, two hundred twenty-three thousand, four hundred forty-five".